trig 30
posted by Ray on .
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.

cos^2 Ø  6sin 2Ø = 0
cos^2Ø  12sinØcosØ = 0
cosØ(cosØ  12sinØ) = 0
cos Ø = 0 or 12sinØ = cosØ
Ø = 90 degrees or ......