Question

ifsin(a+b)=sin a cos b+ cos a sin b evalutate sin75

Answer 1

sin75= sin(40+35)
= sin 45.cos30+ sin 30. cos 45
=1/√2 *√3/2 + 1/2*1/√2
=√3/4 + 1/2√2
=(2√6 + 4)/8√2
=(√6+2)/4√2

Answer 2

then put the value u will get ur answer