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1 + tan² x = sec² x
1 +
sec² x ........terbukti
jadi 1/(1 - cosec²x) = 1/-cot²x = - tan²x
1 = cosec²x
1 - 1
1 - 1
1 - cosec²x
1
1 - 1
1 - (-tan²x)
1
1 - 1
1 + tan²x
1
1 - 1
sec²x
1
1 - cos²x
1 = cosec²x terbuktikan?
sin²x