Question

cos2A. cos2B + sin^2 (A-B) - sin^2 (A+B) is =?

Answer 1

and could u plz give us the answer to check it?

Answer 2

the answer should be cos(2A + 2B)

Answer 3

sin(a-b) - sin (a+b) = -2 cos a sin b

Answer 4

yeah, you made a slight 'sign' error @mukushla

Answer 5

sin^2 (A-B) - sin^2 (A+B)= -sin2A cos2A

Answer 6

yes thats right
try to get
sin^2 (A-B) - sin^2 (A+B)=-sin2A cos2A
with expanding it
then u have
cos2A. cos2B-sin2A cos2A=cos(2(A+B))

Answer 7

plzzcan u upload the full steps

Answer 8

sin^2 (A-B) - sin^2 (A+B)=-sin2A cos2A??????????

Answer 9

just work out yourself .. this is simple a^2-b^2 algebra

Answer 10

hw?

Answer 11

(a-b)(a+b)

Answer 12

sin^2 (A-B) - sin^2 (A+B) = (sin (A-B) - sin(A+B))(sin (A-B) + sin (A+B))

Answer 13

got itthxxx