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sin(t)cos(t) which in the text, they jump from that straight to

[tex] x(1-x^2)^{\frac{1}{2}} [/tex]

I've forgotten a lot of what I learnt in my first few years of Uni and I just can't remember why they equal, I thouht it might be an identity, but I have looked on the net and can't find one... can someone please shed some light? Thanks