Let S - sec-sec- - 4sec-cosec- - 9cosec- where - - - -0-2- Find the minimum value of S and the value of - and - for which it is minimum

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Properties with Negative X

Let S = sec²θ...

Question

Let S = sec²θsec²Φ + 4sec²θcosec²Φ + 9cosec²θ where θ, Φ ε (0,π/2). Find the minimum value of S and the value of θ and Φ for which it is minimum

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