Question

prove that : sin 15° × cos 15° + cos ^2 15° = 1​

Answer 1

Answer:

We know that cos (a-b) = cos a * cos b + sin a *sin b cos 15 = cos (45–30) => cos 15 = cos 45 * cos 30 + sin 45 * sin 30 => cos 15 = (1/√2)* (√3/2) + ...