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Question 218937: evaluate (1+i)^12 by using De Moivre's Theorem.express the result in rectangular form
Click here to see answer by Alan3354(6097)

Question 220645: Find the exact value of tan 15 degrees
Click here to see answer by stanbon(26297)

Question 220645: Find the exact value of tan 15 degrees
Click here to see answer by Theo(675)

Question 220723: Find all solutions to the equation. Use a lower-case n to denote an arbitrary integer; separate your answers with commas; use the most compact expressions possible.
cot(x) + 1 = 0 ;
Click here to see answer by stanbon(26297)

Question 220794: find the antiln(-0.049) to the nearest ten thousandth
Click here to see answer by Alan3354(6097)

Question 220845: Hi Dear Tutor,
Please Please Please Help me with this awful problem!!!! I can't figure out how to solve it! thank you so much!!!

Please help me with this problem by completing the square.
9x^2-18x=-3
Click here to see answer by ankor@dixie-net.com(6693)

Question 221128: i am not a student, but have a geodesic dome build project under way.
I am looking to find a radius R of a known chord c and rise m.
i am using
i can see the Pythagoras in the top right of the equation.
I just dont understand the relationship of that to R.
it seams to be a 2 to 1 ratio. is there an established ratio between the sum of the squares of the rise and half the chord to the arcs radius?
Click here to see answer by Alan3354(6097)

Question 221254: Prove that:
tanx +tan(x+pi/3) +tan(x+2pi/3)=3
Click here to see answer by Edwin McCravy(2922)

Question 221854: 1.What is the answer to X^2+x+2=0 using complex number system?
2. what is the real solution of the equation by factoring?
x^3=6x^2-9x-54=0
Click here to see answer by Alan3354(6097)

Question 222081: the solution set for x^2+5x+6<0
Click here to see answer by checkley77(7072)

Question 222093: Time of Descent:
A submarine traveling at 240 mph is descending at an angle of depression of 5 degees. How many minutes, to the nearest tenth, does it take the submarine to reach a depth of 80 feet?
Click here to see answer by Alan3354(6097)

Question 222367: I just need an example on how to do one problem and then I will work on the other problems myself. Thank you in advance.
Graph each function. Identify the domain and range.
f(x)=[[x+1]]

Click here to see answer by stanbon(26297)

Question 222513: How do I graph a peicewise function of
y= {x+4 if x is less than or equal to -2
-x, if x > -2
I really need help, thanks!
Click here to see answer by jsmallt9(594)

Question 222601: How do I solve this problem (csc x - 1)(csc x + 1)
Click here to see answer by chibisan(120)

Question 223391: I am having trouble solving the following problem
1/A= 1/b + 1/c
A= 3
B= 5
Find c
So, 1/3=1/5+1/c
Those are all fractions.
what should I do?
Click here to see answer by Earlsdon(4900)

Question 223721: cosecant theta + cotangent theta * cosecant theta - cotangent theta = 1
Click here to see answer by jsmallt9(594)

Question 223806: what would be the answer to this
log x=3
Click here to see answer by Alan3354(6097)

Question 224269: Determine the quadrant in which θ lies given cotθ < 0 ,cscθ > 0. I know its the 2nd quadrant but can you tell/show me why?
Click here to see answer by Alan3354(6097)

Question 224355: Find an equation of the line in point slope form that passes through (4,3) and is parallel to the line 3x - y = 7.
i go to a correspondance school and cant figure out how to do this.
Click here to see answer by Alan3354(6097)

Question 224422: I need help verifying trid identities. The problem is (1 - sinx)/(1 + sinx) = (secx - tanx) squared. I multiplied by 1 - sin and got cos squared on bottom, then i got stuck.
Click here to see answer by Alan3354(6097)

Question 224457: which of the following trigometric wquations is false for all of x?
sin x= 2/ sqroot of 5
tan x= -100
sex x = sqroot of 3/ 7
please show work?
Click here to see answer by Alan3354(6097)

Question 224461: what is the period of the following function?
y=2tan(3x-pie/2)
1. 1
2. pie
3 pie/3
4. pie/2
5. 2pie/3
please show work and thankyou for your help
v/r,
bobby
Click here to see answer by Alan3354(6097)

Question 225038: How to verify this equation
cos^2x*sin^2x=1-2sin^2x
Click here to see answer by Alan3354(6097)

Question 225233: a wire 120 meters long on a angle of 41 degrease is going to the top of a tower.
what is the height of the tower
Click here to see answer by chibisan(120)

Question 225205: 2 sin 0 negative 1 equals 0 to the equation in the interval from 0 to 2 pie
Click here to see answer by chibisan(120)

Question 225764: given tangent of theta is 2. use trigonometric identities to find the exact value of cot( 90 degreess minus theta).

Click here to see answer by Alan3354(6097)

Question 225831:
Given that sinA=1/2 , find the vlue of sinAcos(90degree-A).
im lost..
Click here to see answer by chibisan(120)

Question 226506: I need to solve the following equation for exact solutions over the interval [0,360].
csc(2x) tan x = 2tan x
Click here to see answer by Alan3354(6097)

Question 225799: given tangent of theta is 2. use trigonometric identities to find the exact value of cot( 90 degreess minus theta).

Click here to see answer by chibisan(120)

Question 226838: the formula used to convert temperature measurements form degreess Celsius (C) to degrees Fahrenheit (F) is shown below.
F=9/5C+32
What is the Fahrenheit equivalent of 30 degrees celsius?
Click here to see answer by rfer(2688)

Question 226835: A local convenience store determines it's cost by using the following formula, where C is the costs and h is the number of hours per day that the store is open. C=50h-150
How many hours must the store be open to have the costs equal $800?

Click here to see answer by rfer(2688)

Question 226830: What is the value of x in this equation?
2/5x+4=16
Click here to see answer by rfer(2688)

Question 220902: find two values of theta, cos theta=square root of 2 divided by 2
Click here to see answer by chibisan(120)

Question 31257: tan theta + cot theta = 1 over the sin theta times cos theta
It asks me to:
"Verify the Identity. Justify each step."
Click here to see answer by chibisan(120)

Question 31257: tan theta + cot theta = 1 over the sin theta times cos theta
It asks me to:
"Verify the Identity. Justify each step."
Click here to see answer by jsmallt9(594)

Question 226943: find all real values of x such that f(x)=0: f(x)=x^3-x
Click here to see answer by chibisan(120)

Question 33858: cos theta = 5/12 and tan theta is negative, find the exact valcue for sin theta.
Click here to see answer by chibisan(120)

Question 33858: cos theta = 5/12 and tan theta is negative, find the exact valcue for sin theta.
Click here to see answer by jsmallt9(594)

Question 226999: solve
2cosx - 3cosxsin^2x = 0 , x is more than 0 and less than pi
Click here to see answer by chibisan(120)

Question 227714: -6-4y=-24
2x+7y=13
Click here to see answer by drj(1380)

Question 228250: Help me solve this word problem please. "A freight train and a diesel train left at the same time. The trains traveled in opposite directions. The diesel train traveled 10km/h faster than the freight train. After one hour they were 140 km apart. Find the freight train's speed.
Click here to see answer by rfer(2688)

Question 228233: How do I solve this word problem? " A new car was advertised for 12.5% off original price. The sale price was $14,599. What was the original price?

Click here to see answer by JenniferTutors(46)

Question 228303: how do you verify the idenity of secX-sinXtanX=cosX
Click here to see answer by user_dude2008(716)

Question 228733: what is i^42
Click here to see answer by jim_thompson5910(13794)

Question 228740: find the product
2(cos10 degrees + i sin10 degrees)4(cos20 degrees + i sin20 degrees) then express the result in rectangular form
Click here to see answer by rapaljer(3625)

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