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mathematics

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1.)Sin^-1(x)+Sin^-1(y)+Sin^-1(z)= pie
Prove that
X.root(1-y^2)+y.root(1-x^2)+z.root(1-z^2)=2xyz
2.)tan^-1(yz/xr)+tan^-1(zx/yr)+tan^-1(xy/zr)=pie/4
Prove that
x^2+y^2+z^2=r^2
Tomorrow is my exam.please give me answer as soon as possible.

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