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cos 2A ...?
jawab :
tan A = p
depan = p
samping = 1
miring = √(p²+1)
cos 2A = cos² A - sin² A
cos 2A = (sa/mi)² - (de/mi)²
cos 2A = 1/(p²+1) - p²/(p²+1)
cos 2A = (1-p²)/(p²+1)