Question

can anyone please answer these questions please

Answer 1

Answer:

hey mate here is ur ans

Step-by-step explanation:

A, B, C is the interior angle so it's sum is 180°

I. LHS= cos(A+B) /2

= cos(180-C)/2 (A+B+C = 180°)

= cos2(90-C/2) /2

= sin2(C/2)/2 = sinC/2 = RHS

2. LHS = tan(C+A) /2

= tan (180-B) /2 [A+B+C = 180°]

= tan2(90-B/2) /2

= cot2(B/2)/2 = cotB/2 = RHS

HOPE IT HELP U