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bukti:
(1 + cos x)² - (1 - cos x)²
= (1 + 2 cos x + cos² x) - (1 - 2 cos x + cos² x)
= 1 + 2 cos x + cos² x - 1 + 2 cos x - cos² x
= 2 cos x + 2 cos x
= 4 cos x (terbukti)
semoga membantu ya :)
TERBUKTI
Semoga membantu :)