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For any quadrilateral ABCD which of the ...

For any quadrilateral ABCD which of the following is INCORRECT `(a)sin(A+B)+sin(C+D)=0` `(b)cos(A+B)-cos(C+D)=0` `(c)tan((A-B-C-D)/2)=cotA` `(d)tan((A+B+C-D)/2)=-tanD`

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