Posted by **yoshi** on Sunday, December 16, 2012 at 1:27pm.

6. Prove that tan λ cos^2 λ + sin^2λ/sin λ

= cos λ + sin λ

10. Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ

17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w = cos w-cot w cos w

23. Find a counterexample to shows that the equation sec a – cos a = sin a sec a is not an identity.

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