Question

please solve this question​

Answer 1

+cosx/1-cosx = secx + 1/secx -1 2. (tanx + cotx)^2=sec^2x csc^2x 3. cos(x+y) cos(x-y)= cos^2x - sin^2y

Prove that cos(A+B) + sin(A-B) = 2sin(45°+A)cos(45°+B)

Answer 2

Answer:

i hope this will help u dude