1. Z=4 10-6
2 y= 6 48/8
3. Q= 13 12+1
6 m=15 11+4
7. 21 19+2
8. S=2 3-1
9. C=6 24/4
Y=10
x+3=y
x=7
I think this is the answer
hope it helps!
Answer:
see explanation
Step-by-step explanation:
using the identity
cos2a = 2cos²a - 1 , then
cos2a
= 2[
(a +
) ]² - 1
= 2 [
(a² +
+ 2) ] - 1
=
(a² +
) + 1 - 1
=
(a² +
) ← thus verified