Question

Rewrite the given expression in terms of the sum or difference of two angles. sin pi/7 cos pi/2 + cos pi/7 sin pi/2

Answer 1

Use the Identity over here!
sin(A+B) = sinA.cosB + cosA.sinB
So rewite the expression just like that! :)

Answer 2

sin (x+y)=sinxcosy+cosxsiny

Answer 3

The choices are
A. sin(pi/7 -pi/2)
B. cos (pi/7 - pi/2)
C. cos (pi/7 + pi/2)
D. sin (pi/7 + pi/2)

Answer 4

Obviously it is not A or B because it is -ve so choose the best answer according to the expression I gave you!

Answer 5

C

Answer 6

i mean D

Answer 7

It cannot be C because it is cos then right?

Answer 8

THANK YOU!