Questions on Algebra: Trigonometry answered by real tutors!

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Question 449907: Is 162 degrees converted to radians 9pi/10?
Click here to see answer by jim_thompson5910(28595)

Question 449589: Find all solutions of the equation in the interval [0,2pi) .
cos(theta)=0.7125
If there is more than one solution, separate them with commas.
Do not round any intermediate computations, and round your answer(s) to the nearest hundredth.
Can someone help me with this? Thanks
Click here to see answer by richard1234(5390)

Question 450319: Find the exact values of the six trigonometric functions of the angle given in the figure. Use the Pythagorean Theorem to find the third side of the triangle.

C^2=A^2+B^2
C^2= 4^2+4^2
C^2= 16+16= 32
SQRT (C6^2) = SQRT (32) or 5.656
Sin: 4/sqrt (32)
Cos: 4/sqrt (32)
Tan: 4/4=1
Sec: sqrt (32)/4
Cos: sqrt (32)/4
Cot: 4/4=1

Click here to see answer by stanbon(57346)

Question 450296: Find the values of x for which the equation sin x=-1 is true
a. 2Pin
b. Pi/n +2Pin
c. Pi+2Pin
d.3Pi/2Pin
Click here to see answer by stanbon(57346)

Question 450286: Suppose you live about 5.1 miles from a tower. from your home you see a plane directly above the tower. your angle of elevation to the plane is 21 degrees. what is the planes altitude?
Click here to see answer by ankor@dixie-net.com(15652)

Question 450547: sinx=1/2
Click here to see answer by stanbon(57346)

Question 450540: sinA/cscA+cosA/secA
pls help me. thanks....
Click here to see answer by poliphob3.14(115)

Question 450600: Secx sinx/tanx+cotx=sin^2x
Click here to see answer by rwm(914)

Question 450597: Secx sind/tanx+cotx=sin^2x
Click here to see answer by rwm(914)

Question 450821: graph the function.
y = cos (3θ + 135) -1
Click here to see answer by stanbon(57346)

Question 450825: Prove the identity
(1+ sec x)/(sec x) = 2cos^2 (1/2) x
Click here to see answer by stanbon(57346)

Question 450563: what is the answer to this problem: ((-2)/(c^2+2c-3))-((5)/(3-3c))=((4)/(3c+9))
im really having a lot of trouble with it.
Click here to see answer by lwsshak3(6505)

Question 451056: Please help me solve this problem:
Find the solutions on the interval [0,2pi).

Click here to see answer by tinbar(128)

Question 450913: i'm confused on trying to find out what this equals.. the problem is
4^x-2^x-12=0
Click here to see answer by robertb(4012)

Question 451184: How do I develop the identity for by using the identity for ?
Click here to see answer by Edwin McCravy(8909)

Question 451237: MARK ALL IMPORTANT PARTS.
x^2/4 + y^2/25 = 1
Click here to see answer by ewatrrr(10682)

Question 451411: Simplify completely

Click here to see answer by kingme18(98)

Question 451441: I would really appreciate some help on this problem.
Use a calculator and inverse functions to find the radian measures of the angles whose cosine is 0.75.
Click here to see answer by edjones(7569)

Question 451415: Prove that the identity is true

Click here to see answer by lwsshak3(6505)

Question 451527: use A=P(1+r/n) or A=Pe^rt to find the balance after 5 years for $1500 invested at 8% compounded quarterly.
Click here to see answer by lwsshak3(6505)

Question 451699: I would appreciate some help with these two questions:
Solve each question for 0 ≦ Ꮎ < 2p
1.
2.

Click here to see answer by Edwin McCravy(8909)

Question 451912: High, can you help me verify the following formula? And please show steps so I can try and figure out how to do it. Thanks!
Cos[θ]^2/(1 - Sin[θ]) = 1 + Sin[θ]
I'm not even sure where to start!
Click here to see answer by stanbon(57346)

Question 451756: how do i find the exact value of each trigonometric function using the unit circle?
1. tan225
how do i use a reference angle to find the exact value of the sine, cosine, and tangent of each angle?
1.150
2.-225
3.-300
4.11(pie symbol)/6
Click here to see answer by lwsshak3(6505)

Question 451913: Find the diameter of the circle for BC = 16 and DC = 28. Round to the nearest tenth.(The diagram is not drawn to scale.)
http://i54.tinypic.com/32zo07b.jpg
Click here to see answer by lwsshak3(6505)

Question 451999: 177degrees
measure of an angle is given. classify the angle as acute, right, obtuse or straight
Click here to see answer by stanbon(57346)

Question 452014: The value of csc 152 degrees to the nearest hundreth
Click here to see answer by stanbon(57346)

Question 452041: Fing its period and amplitude; then graph carefully two complete periods of
y = 2 sin (12πx) + 2
Plot, giving coordinates, all x and y intercepts, and all points where y = 4, x = 1/48 and y = 3.
Click here to see answer by Alan3354(30993)

Question 451819: Two drivers leave home at the same time and travel on straight roads that diverge by 70 degrees. One driver travels at an average speed of 83.0 km/h. The other driver travels at an average speed of 95.0 km/h. How far apart will the two drivers be after 45 min?
Click here to see answer by ankor@dixie-net.com(15652)

Question 452156: how do i find x? log[13](3x+9)-log[13](3)=log[13](12)
Click here to see answer by Alan3354(30993)

Question 452370: a particle moving with speed v hits a barrier at an angle of 60° and bounces off at an angle of 60° in the opposite direction with a speed reduced by 20% find the velocity of the vector of the the object after the impact
Click here to see answer by Alan3354(30993)

Question 452395: what angle is coterminal with angle of 45 degrees
Click here to see answer by MathLover1(6632)

Question 452466: how would i factor 81x^(3n+4)-3x^(6n+4)
Click here to see answer by stanbon(57346)

Question 452568: Find the value of the trigonometric expression:
sin 50degrees cos 170degrees-cos 50degrees sin 170degrees

also:
cos 150degress cos 120degrees-sin 150degrees sin 120degrees
Click here to see answer by Edwin McCravy(8909)

Question 452571: verify the identity. justify each step.
tan0 + cot0 = 1/sin0cos0
Click here to see answer by MathLover1(6632)

Question 452573: The line of sight from a small boat to the light at the top of a 45-foot lighthouse built on a cliff 25 feet above the water makes a 39 degree angle with the water. To the nearest foot, how far is the boat from the cliff?
Click here to see answer by ankor@dixie-net.com(15652)

Question 452791: Use trigonometric identities to transform one side of the equation into the other.
cos theta sec theta= 1
Click here to see answer by jim_thompson5910(28595)

Question 452828: Simplify the trigonometric expression. tanOcotO
Click here to see answer by robertb(4012)

Question 452834: Find the value of the trigonometric expression. cos 150degrees cos 120 degrees - sin 150 degrees sin 120 degrees
Click here to see answer by robertb(4012)

Question 452918: Find the exact value of the expression. sin195 degrees
Click here to see answer by robertb(4012)

Question 452990: Can someone help me. We just started this matter less than a week ago and I don't understand one bit of it. Textbooks are written in a foreign language to me.
Thanks
Find the variation constant in which y varies inversely as x, and the following condition exists.
y=14 when x= 1/7
k=
Click here to see answer by mananth(12270)

Question 453124: Find the value of each expression.
1. tan^-1 (π/5)
Click here to see answer by stanbon(57346)

Question 453125: Simplify each trigonometric expression.
1. tan (theta) / cot (theta)
I worked this out and got 2tan(theta) is that right?
Click here to see answer by stanbon(57346)

Question 453117: In is a right angle. Find the remaining sides and angles. Round your answers to the nearest tenth.
1. a = 36, b = 23
2. b = 20, c = 40
3. a = 14, c = 23
Click here to see answer by Alan3354(30993)

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