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Given the product p of sines of the ang...

Given the product p of sines of the angles of a triangle and the prodcut q of their cosines, find the cubic equation whos coefficients are functions of p and q.

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The correct Answer is:
`z^(3)+(2q-1)z^(2)+(p^(2)+q^(2)-2q)z-q^(2)=0`
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