establish the identity

la12 · #1 $Old$ November 1st, 2009, 05:11 PM

1) (1+cos u/1-cos u) - (1-cos u/1+cos u) = 4 cot u csc u

2) (csc x-1/csc x+1) = (cot^2 x/csc^2 x+2 csc x+1)

3) 9 csc^2θ - 7 cot^2θ = 2 csc^2θ +7

4) (cos u/1+tan u) - (sin u/1+cot u) = cos u - sin u

adkinsjr · #2 $Old$ November 1st, 2009, 06:50 PM

Quote:

Originally Posted by la12 $View Post$

1) (1+cos u/1-cos u) - (1-cos u/1+cos u) = 4 cot u csc u

2) (csc x-1/csc x+1) = (cot^2 x/csc^2 x+2 csc x+1)

3) 9 csc^2θ - 7 cot^2θ = 2 csc^2θ +7

4) (cos u/1+tan u) - (sin u/1+cot u) = cos u - sin u

You aren't suppose to just post problems for others to solve. You should show that you've at least attempted to prove these identities. No one here wants to do someones homework for them. Show some effort, and you will be helped.