Verify the following identity.

1) sin(x+y)
__________ = tanx+tany
cosxcosy

2) Write cos3x in terms of cosx

I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

Similar Questions
  1. 1.csc^2x-1/csc^2x=cos^2x2.1/1-cosx+1/1+cosx=2csc^2x 3.sinxcosy+cosxsiny/cosxcosy-sinxsiny=tanx+tany/1-tanxtany
    1. answers icon 0 answers
  2. verify the identity(tanx+cotx) (1) __________ = ______________ (tanx-cotx) (sin^2x-cos^2x)
    1. answers icon 1 answer
  3. prove that(tanx + tany) / (cotx + coty) = (tanx)(tany)
    1. answers icon 1 answer
    1. answers icon 0 answers
more similar questions