 Ask Remember Me? lbcp15 Posts: 1, Reputation: 1 New Member #1 Oct 30, 2011, 05:35 PM
Solve these three proofs?
(Sin A/(1 Cos A)) ((1 Cos A)/Sin A)= 2Csc A

1-Tan^2(-A)=Sec^2 A

(1-tan^2 A)/(1 Tan^2 A)=2Cos^2 A -1 Unknown008 Posts: 8,076, Reputation: 723 Uber Member #2 Oct 31, 2011, 12:17 AM
1. Start by combining the fractions.

2. Use the fact that tan(-a) = -tan(a)

3. Convert everything to the cos and sin ratios and simplify the fraction on the left.

Can you try those out for a start?

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