Question

cos (x/2 -x/2)=
a. sin x
b. cos x/2
c. sin x/2
c. cos x

Answer 1

Step-by-step explanation:

cosx/2 cosx/2+sinx/2 sinx/2

= cos²x²/4+sin²x²/4

the answer will be cos (x/2-x/2)=cos0 =1

the answer will be a

Answer 2

Answer:

C

Step-by-step explanation:

cos(90-x)=sinx

then

cos(x/2-x/2)=sin(x/2)