Question

please give me ans? ????????????​

Answer 1

........... Solution............

$\frac{1}{(tan \: a + \: cot \: a)} \\ = \frac{1}{ \frac{sin \: a}{cos \: a} + \frac{cos \: a }{sin \: a} } \\ = \frac{sin \: a \: cos \: a}{sin {}^{2} \: a + cos {}^{2} \: a} \\ = sin \: a \: cos \: a$

option (b)sinA cos A