Question

Sin x + cos x = -dan < x < maka nilai 2 sin x cos x =

Answer 1

Sin x + cos x = 1/5
(sin x + cos x)² = (1/5)²
sin² x + 2 sin x cos x + cos²x = 1/25
sin²x + cos²x + 2 sin x cos x = 1/25
1 + 2 sin x cos x = 1/25

2 sin x cos x = (1/25) - 1
2 sinx cos x = -24/25