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there's a few problems that I can't solve..maybe you guys can help me:
1) [sin(x-y)] / [cos(x+y)] = [tan(x)-tan(y)] / [1-tan(x)tan(y)]
2) [cot^2(u)-1] / [cot^2(u)+1] = [csc^2(u)-sec^2(u)] / [csc^2(u)+sec^2(u)]
3) [sec^2(u)-tan^2(u)+tan(u)] / sec(u) = sin(u)+cos(u)
It's really urgent..my brother has a test tomorrow and I'm trying to help him, so knowing how to solve this would help a lot. Thanks.
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