Question

cos^2 x - cos^2 y = ?

Answer 1

@Mani_Jha

Answer 2

(cos x - cos y) (cos x + cos y)

Answer 3

= (-2 sinx siny ) (2 cos x cos y)

Answer 4

@experimentX

Answer 5

seems all right.

Answer 6

then,,,,

Answer 7

2 sin x cos x = sin 2x

Answer 8

also try verifing from WA .. notify me if you get something wrong

Answer 9

= sin 2X . - sin2Y

Answer 10

is that correct

Answer 11

check it from WA.

Answer 12

most probably.