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**More Trig Identity Proofs .........**

## Homework Statement

1. cot^2x - 1 = cot2x

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2cotx

2. tanx + cotx = 2csc2x

3. cos(A+B) = 1-tanAtanB

--------- ----------

cos(A-B) 1+tanAtanB

## Homework Equations

## The Attempt at a Solution

Anyone how to do these proofs??

i've tried simplifying all of these as much as i could but i don't seem to get the

right answer ...... can anyone show me???

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