Question

If tan25=a , prove that

$\tan(25) = a \: prove \: that \: \frac{ \tan(115 - \tan(115) ) }{1 + \tan(115. \tan(115) ) } = \frac{1 - {a}^{2} }{2a}$
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Answer 1

Answer:

please refer to class 9 ml aggarwal ICSE maths book