Question

D%7B1%20%2B%20tan%20%5Calpha%20%7D%20" id="TexFormula1" title=" \frac{cot \alpha }{1 + cot \alpha } = \frac{1}{1 + tan \alpha } " alt=" \frac{cot \alpha }{1 + cot \alpha } = \frac{1}{1 + tan \alpha } " align="absmiddle" class="latex-formula">
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Answer 1

Im not sure what its asking.. whats the question?