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In any quadrilateral ABCD,show that cosAcosB-cosCcosD=sinAsinB-sinCsinD

In any quadrilateral ABCD,show that cosAcosB-cosCcosD=sinAsinB-sinCsinD

Grade:11

1 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
2 years ago
Dear student

On ssimplification of to prove

We get

Cos ( A+ B ) = cos ( C+D)

As quadrilateral is not of specific type we cannot make this equation generalized

Example A and B be 45

And C and D be 135

Regards

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