How do you find all solutions if 0 ≤ θ < 2π for #cos 2x cos x − sin 2x sin x = sqrt2/2#?
1 Answer
Dec 6, 2015
Solve trig equatiom.
Ans:
Explanation:
Apply the trig identity; cos (a + b) = cos a.cos b - sin a.sin b
We get:
Trig table of special arcs gives -->