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Minimum Value

I recently solved a trigonometric question which asked for the minimum value of the \((\sin\theta + \csc\theta)^{2}+(\cos\theta +\sec\theta)^{2}\).I found there ar two answers, which one of them is correct?

A)8 B)9

Please help....

Note by Puneet Pinku
3 weeks, 1 day ago

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Hint: Expand and simplify the expression by using \(\sin^2 A + \cos^2 A = 1\). Then apply double angle formula \(\sin(2A) = 2\sin A \cos A\). Pi Han Goh · 3 weeks ago

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Can you show your working?

I believe that you didn't check the conditions under which we could apply arithmetic mean - geometric mean. Calvin Lin Staff · 3 weeks ago

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