Question

sin70- sin10=?

Answer 1

sin70- sin10= 2cos(70+10)/2 sin(70-10)/2= 2cos40sin30

Answer 2

\[\sin P - \sin Q = 2 \cos \frac{P+Q}{2}\sin \frac{P-Q}{2}\]

Answer 3

sin(70) = sin(90 - 20) = cos(20) [As sin(90 - x) = cos(x)]

Answer 4

cosx=sin(90°-x)

Answer 5

@shruti Could the answer be using factor formula instead? becuz I think he's asking for difference of 2 sines