buktikan bahwa cot x sec2 x / 1 + cot2 x = x

Bab Trigonometri
Matematika SMA Kelas X

cot x . sec² x / (1 + cot² x)
= (cos x / sin x) . sec x . sec x / (cosec² x)
= sec x . cosec x / (cosec x . cosec x)
= sin x / cos x
= tan x

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