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Write the least value of cos^2 x + sec^2 x.

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Write the least value of cos2 x + sec2 x.

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Best answer

We know that cos2x and sec2x ≥ 0

∴ By applying AM and GM we get,

⇒ cos2 x + sec2 x ≥ 2

∴ Least value of the given function is 2.

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