Question

please help me to solve this Q

Answer 1

Answer:

HERE IS YOUR ANSWER

LHS : SIN 25 .COS 115

SIN 25 . COS(90+25)

SIN 25.(-SIN25)

-SIN^2 25

-{1-COS2*25/2}

1/2 { COS 50-1}

1/2{COS (90-40)-1}

1/2{40-1}= RHS

HOPE IT HELPS YOU