Question

if sin (a -b) = sinA.cosB - cos a . sinB . then find the value of sin 15​

Answer 1

we can write

sin 15°= sin(45°-30°)

=sin (45°-30°)

=sin45°.cos30°- cos45. sin30°

=1/√2 . √3/2 - 1/√2 . 1/2

(√3-1) / 2√2 ( ans)