Homework Help: trig 30

Posted by Ray on Wednesday, March 10, 2010 at 9:41pm.

If cos^2 theta -6 sin 2 theta =0, one value of theta is a)0 degrees b) 90 degrees c)180 degrees or D)255 degrees.
Please show me how to do it and not just give answer cause I have two more questions that are similar. Thanks so much.

trig 30 - Reiny, Thursday, March 11, 2010 at 12:20am
cos^2 Ų - 6sin 2Ų = 0
cos^2Ų - 12sinŲcosŲ = 0
cosŲ(cosŲ - 12sinŲ) = 0
cos Ų = 0 or 12sinŲ = cosŲ
Ų = 90 degrees or ......

Answer this Question

Related Questions

Trig(continued) - 2)Find the solution of sin2 theta = cos theta if 0 -< ...
Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...
Trig(3 all with work) - 1)Find the exact value of cos 105 by using a half-angle ...
Math 30 Trig - What is the value of theta if 9 cos^2 theta + 3 cos theta = 0 ...
maths trigonometry - sin (60 degrees + theta)-cos(30 degrees - theta)is equal to...
Calculus - I wanted to confirm that I solved these problems correctly (we had to...
Trigonometry - I don't understand how I'm supposed set the problem up or...
Trig - Which expression equivalent to: cos(theta + pi/2). A)cos theta B)-cos ...
Algebra II - Multiple Choice Which expression is NOT equivalent to 1? (theta) ...
trig - Hi, I need to find the domain and rnge of the following: 1. X= 1/2 (cos ...

For Further Reading

First Name:
School Subject:
Answer: