Question

Find theta , if sin 2theta= cos (theta -18) where 2theta is an acuta angle

Answer 1

Let Theta = X

Sin 2X = Cos (X-18)

Sin 2X = Sin (90-X+18)...(Cos X=Sin 90-X)

2X=108-X

2X+X=108

3X=108

X=108/3

X=36

Hence, Theta=36°

Answer 2

Answer:

plz check out this one

hope this would help u

plz mark as brainlist answer