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(cos^3(pi/2+x)cot(3pi+x)sec(x-3pi)c o s ...

`(cos^3(pi/2+x)cot(3pi+x)sec(x-3pi)c o s e c((3pi)/2-x)/(tan^2(x-pi)sin(x-2pi)`

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Prove that: (a) (cos(pi+x) cos(-x))/(sin(pi-x)cos(pi/2+x))=cot^(2)x (b) cos((3pi)/2 + x)cos(2pi+x){cot ((3pi)/2-x)+cot(2pi+x)}=1

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