1.

If A,B,C,D be the angles of a cyclic quadrilateral, taken in order, prove that: cos(180∘−A)+cos(180∘+B)−sin(90∘+D)=0

Answer»

If A,B,C,D be the angles of a cyclic quadrilateral, taken in order, prove that: cos(180A)+cos(180+B)sin(90+D)=0



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