Question

1-tana/1+tana=cota-1/cota+1​

Answer 1

$\frac{1 - \tan(a) }{1 + \tan(a ) } = \frac{1 - \frac{1}{ \cot(a) } }{1 + \frac{1}{ \cot(a) } } = \frac{ \cot(a) - 1 }{ \cot(a + ) + 1}$

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