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If A B and C are the angle of a triangle...

If A B and C are the angle of a triangle then which of the following is INCORRECT (a)`sin(A+B)-sinC=0` (b)`sin((A+B)/2)-cos(C/2)=0` (c)`cos(A+B)+cosC=0` (d)`tan((A+B-C)/2)=tanC`

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