Question

Two sides of triangle are given. find the angle between them such that the area of the tringle is maximum

Answer 1

This is precisely what the cosine theorem allows you to compute:

c2=a2+b2−2abcos(theta)

where theta is the angle opposite to c

(uhm, yes, is probably be called 'law of cosine' rather than 'cosine theorem').

Hope it helps you :-)

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