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= cosa . (1/cosa)² / (1 + (cosa/sina)²)
= 1/cosa /( (sin²a + cos²a) /sin²a)
= (sin²a / cosa) /(1)
= sin²a . seca
= (cos(x) * 1/cos²(x)) / (1/sin²(x))
= (1/cos(x)) / (1/sin²(x))
= 1/cos(x) * sin²(x)
= sin²(x) / cos(x)
= sin(x) (sin(x) / cos(x))
= sin(x) tan(x)
= cos(x)
hahaha keputer puter X_____X