Question

simplify sin2/1+cos2​

Answer 1

$sin 2/(1 + cos 2)\\=> sin 2/(2cos^21)\\=> 2sin1cos1/(2cos^21)\\=> tan 1$

Properties used are:

Step 2: $1 + cos \alpha$ = $2cos^2 (\alpha /2)$

Step 3: $sin 2\alpha = 2sin\alpha cos\alpha$

Comment if you have any further doubt in this question.