Question

Find one angle theta that satisfies each of the following:

Answer 1

cos\[\cos \theta=\sin(\theta/4 + 3 degree)\]

Answer 2

just convert both sides in terms of cos angle or sin angle and then equate the angles

Answer 3

like r.gupta said
\[\cos \theta = \sin (\theta + \frac{\pi}{2})\]
\[-\sin \theta = \cos (\theta + \frac{\pi}{2})\]

^^

Answer 4

those identities are in radians, however. Keep that in mind.