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# C2 maths help watch

1. show that (cos x sin x) / (tan x) = 1 - sin^2 x
2. sinx / cosx = tanx

Rearrange this and you get sinx/tanx = cosx

so cosxsinx/tanx = cosx^2

And you know sinx^2 + cosx^2 = 1

so cosx^2 = 1 - sinx^2

Hope that helps
3. (Original post by man111111)
show that (cos x sin x) / (tan x) = 1 - sin^2 x
So express the fraction in terms of sine and cosine first, then simplify...

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