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In DeltaABC,prove that: a) sin2A + sin...

In `DeltaABC`,prove that:
a) `sin2A + sin2B-sin2C=4cosA cosB sinC`
b) `sin(B+C-A)+sin(C+A-B) + sin(A+B-C) = 4sinAsinBsinC`
c) `(cosA)/(sinBsinC) + (cosB)/(sinCsinA) +(cosC)/(sinAsinB)=2`

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