Trig Identity Simplification

1. Aug 24, 2012

Burjam

1. The problem statement, all variables and given/known data

Simplify the following:

(1/cos2θ) - (1/cot2θ)

2. Relevant equations

Various trig identities

3. The attempt at a solution

I tried to make cos2θ into 1-sin2θ and cot2θ into csc2θ-1 but still couldn't find any obvious solution. Help?

2. Aug 24, 2012

micromass

What do you get if you express cot as something using sines and cosines?? What if you then add up the fractions?

3. Aug 25, 2012

Millennial

Did you try simply inverting both fractions? Does that show similarity to a trigonometric identity that you know?