Question

please answer it step by step tomorrow I have to attend my exam. if you give me step by step solution I will follow you​

Answer 1

Solution :-

$\sf \frac{1 - {tan}^{2}45 \degree }{1 + tan^{2} 45\degree }$

$\sf = \frac{1 - {1}^{2} }{1 + {1}^{2} }$

$\sf = \frac{0}{2}$

$\sf = 0$

Hence, the correct answer is option (D) 0