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A trigonometry problem

Please help me out with this problem

Given \[\dfrac{\cos A}{\cos B}+\dfrac{\sin A}{\sin B}=-1.\] Then what is the value of \[\dfrac{\cos^{3}B}{\cos A}+\dfrac{\sin^{3}B}{\sin A}?\]

a ) \(1\)

b ) \(0\)

c ) \(4\)

d ) \(\dfrac{1}{2}\)

Note by Skanda Prasad
6 months, 2 weeks ago

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