Questions on Algebra: Trigonometry answered by real tutors!

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Question 381159: What are the possible values of x domain: [0,2pi).
4sin^3(x) + 2sin^2(x) = 2sin(x) + 1
So far I've:
set equal to zero:
4sin^3(x) + 2sin^2(x) + 2sin(x) + 1 = 0
Click here to see answer by richard1234(5390)

Question 381912: true or false: sin(-85)=-sin85
Click here to see answer by stanbon(57347)

Question 382048: verify: sin4x+2sin2xcos2x+cos4x=tanxcotx
Click here to see answer by richard1234(5390)

Question 382058: verify: cos2x=cos2x-sin2x
Click here to see answer by Alan3354(30993)

Question 382179: Por favor, me ajudar a resolver esta questão. Calcule o número real expresso por:
cos 810º+ 4.cos 3780°-1/2.cos 1350°
A resposta precisa ser -4
Obrigada desde já!
Click here to see answer by Edwin McCravy(8909)

Question 382658: Find 2/3 radians to the nearest tenth of a degree.
Click here to see answer by Alan3354(30993)

Question 382660: Give an example of an exponential function that has a range (3,∞).
Click here to see answer by robertb(4012)

Question 382659: Give an example of an exponential function that goes through the point (-3,1).
Click here to see answer by robertb(4012)

Question 382659: Give an example of an exponential function that goes through the point (-3,1).
Click here to see answer by solver91311(16885)

Question 382657: Give an example of an exponential function that goes through the point (0,4)
Click here to see answer by robertb(4012)

Question 383003: Evaluate the expression using trig identities. State the identity that you use.

sin(pi/12)sin(5pi/12)

Click here to see answer by stanbon(57347)

Question 383273: Find cos (theta) and sin (theta) if the terminal side of (theta) lies along the line y = - 2 x in
quadrant IV.
Click here to see answer by robertb(4012)

Question 383295: if the cotangent of angle theta is 1, the the tangent of angle theta is...
1?
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Question 383314: list the values of the variables for which the rational expression is undefined.
x-5/x+5

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Question 383313: list the values of the variables for which the rational expression is undefined.
b+3/b^2+b-6

Click here to see answer by robertb(4012)

Question 383315: write each rational expression in simplest form and list the values of the variables for which the fraction in undefined.
6/10
Click here to see answer by stanbon(57347)

Question 383310: list the values of the variables for which the rational expression is undefined.
-2d/6c
Click here to see answer by stanbon(57347)

Question 383317: list the values of the variables for which the rational expression is undefined.
4-2(x-1)/x^2-6x+9
Click here to see answer by robertb(4012)

Question 383318: list the values of the variables for which the rational expression is undefined.
5(1-b)+15/b^2-16
Click here to see answer by robertb(4012)

Question 383471: Please help me:
2. If cos x=1/2, then sin x= ?
3. If cotx=1, then x= ?
Thanks
Click here to see answer by stanbon(57347)

Question 383473: Please help me:
1. Which of the shaded regions below represent the graph of {(x,y)(y<=x and y>=0)}?
2. if x is an acute and sin x= 1/2, then cos x= ?
Thanks
Click here to see answer by Alan3354(30993)

Question 383316: list the values of the variables for which the rational expression is undefined.
8c^2/8c^2+16c
Click here to see answer by Fombitz(13828)

Question 383482: how do you convert (1+i)/((square root of 3)+i) to trigonometric form?

Click here to see answer by CharlesG2(828)

Question 383952: Suppose that Q varies directly with x^2 and y inversely with Z
What does the equation look like?
Click here to see answer by Fombitz(13828)

Question 384114: Find the exact value of sin(ACROSS 3/5)
Click here to see answer by Alan3354(30993)

Question 384121: convert 7-3i to rcis theta to the nearest minute
Click here to see answer by Alan3354(30993)

Question 384110: determine the amplitude and period and phase shift of each function.
Then graph one period of the function.

y= sin (2x – π/2)
y= –3 cos 1/3x

Click here to see answer by Alan3354(30993)

Question 384428: A) Calculate Angle E if Cos E = 0.812
B) Calculate Angle E if Tan E = 5/3
Click here to see answer by richard1234(5390)

Question 384992: Hi, I'm having trouble setting up a problem.
Larry has to walk 311.45 feet to his car. He's walking at a rate of 4 MPH. How long will it take him to reach his car? I've figured out that 311.45 feet is equivalent to approximately .059 miles.
Thank you so much!
Click here to see answer by rfer(12660)

Question 385009: I am confused as to how to find sin 11pi/4 on the unit circle. Could you please show me the steps? Thank you
Click here to see answer by richard1234(5390)

Question 384531: The solutions of cos2x – cos x – 2 = 0 are (where k denotes an arbitrary integer)
I know the answer is −π + 2kπ, I just have no idea how to get to that point.
Click here to see answer by richard1234(5390)

Question 385637: find the values of x for which the equation sinx=-1
Click here to see answer by solver91311(16885)

Question 385703: What is the exact numerical value of the expression csc150 degrees and how did you get it?
Click here to see answer by richard1234(5390)

Question 385633: Please help me.
Two cars leave from the same spot at the same time, traveling on straight roads that intersect at an angle of 63 degrees. One car is traveling at 45 mph, and the other at 50 mph. After 3 hours what is the distance between the cars? In the solution, I have to show a diagram of the problem.
Click here to see answer by ankor@dixie-net.com(15652)

Question 385854: A ladder positioned against a house has a slope of 4. The ladder touches the house at a height of 12 feet. What is the size of the ladder?
The slope is 4. The angle between the ladder and the floor let be B.Let the ladder length BC.Let A the point where the floor meets the wall.The triangle ABC has AB perpendicular to AC.
Then we have tan(B)=AC/AB . That is 4=12/AB. Let AB=x
Thus 4/1=12/x. Then we have 4x=12 and x=12/4.So x=3 and AB=3.
Let's use now the Pythagorean theorem to the triangle ABC.
BC^2=AB^2+AC^2
BC^2=3^2+12^2
BC^2=9+144
BC^2=153
BC=sqr(153)
BC=12,36...
and this is the ladder size(12,36 ft)
Click here to see answer by dnanos(83)

Question 386047: ok so i dont kno if this is in the right catagory or not! SORRY!
1. Given the problem x^2 -4x=8
A. Complete the trinomial square (remember that whatever you do to the left side, of the
equation, you must also do to the right side.)
B. Solve the equation from A. Express your answer in simplest radical form.

THANK YOU IN ADVANCE THIS IS HARD FOR ME
Click here to see answer by scott8148(6628)

Question 386285: can you help me solve g(x)=x^(1/4)x^(1/4);g(4)
Click here to see answer by stanbon(57347)

Question 386346: Solve the following system of equations.
x^2+y^2=34
y+2x=7

Click here to see answer by richard1234(5390)

Question 386440: 4sin^2x-(4/cscx)+cosx secx=0
Click here to see answer by Fombitz(13828)

Question 386703: Which one of these are impossible?
a.) tan theta= 0
b.) cot theta= 18/19
c.) sec theta= -4/3
d.) cos theta= 13/12
Click here to see answer by stanbon(57347)

Question 386818: If cos theta = 3/5 and sin theta < 0, find: sin theta, sec theta, csc theta, tan theta, cos theta.
I don't know how to find this at all, can I have an explanation on how?
Click here to see answer by richard1234(5390)

Question 386706: Solve the following equation. assume that all angles are acute
Sin(3B-20`)= Cos(5B+30`)

` is my degree sign because i cant figure out how to get one
Click here to see answer by robertb(4012)

Question 387380: verify: sin^2a/cosa=seca-cosa
Click here to see answer by Alan3354(30993)

Question 387454: sin18+sin30=sin54
Click here to see answer by Alan3354(30993)

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