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nilai sin x > 0
cos x > 0
maka sin x . cos x < 0
.
sin x + cos x = -1/5
(sin x + cos x)² = (-1/5)²
1 + 2 sin x cos x = 1/25
2 sin x cos x = 1/25 - 1= -24/25
sin x cos x = -24/50 = -12/25