Question

Find the value of cos theta if 2 sin 2 theta is equal to under root 3

Answer 1

Step-by-step explanation:

2sin2theta = √3

sin2theta = (√3)/2

2theta = sin^(-1) {(√3)/2}

since sin60 = √3 /2

hence

2theta = 60°

theta = 30°

cos theta = cos 30° = √3 / 2=0.866