Question

Complete the identity: a) sin(A-B) = b) tan(A+B) = c) cos(2A) = (3 answers) helllllllp

Answer 1

do u just need the formula? or u need to derive it ?

Answer 2

he just said complete...not sure what that means honestly

Answer 3

ok, then u just need the formulas: here,
sin (A-B) = sin A cos b -cos A sin B

Answer 4

tan (A+B) = (tan A+ tan B)/ (1+ tan A .tan B)

Answer 5

cos 2A is important.
cos 2A= cos^2A-sin ^2 A
= 1-2sin^2 A
=2cos^2A -1

Answer 6

these are idinteties, remember them

Answer 7

wow thats confusing!! so much stuff. thanks!

Answer 8

welcome :)