If A+B+C=pi, prove that (a) tan 3A+tan...

If `A+B+C=pi`, prove that
(a) `tan 3A+tan3B+tan3C=tan3A tan 3B tan 3C`
(b) `cot""(A)/(2)+cot""(B)/(2)+cot""(C)/(2)=cot""(A)/(2)cot""(B)/(2)cot""(C)/(2)`

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