Identitas trigonometri


Buktikan identitas trigonometri berikut:
1. (\csc (A)-\cot (A))^{2}=\frac{1-\cos (A)}{1+\cos(A)}.

2. \frac{\tan (A)}{1-\cot (A)}+\frac{\cot (A)}{1-\tan (A)}=1 + \sec (A) \csc (A)

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