Question

prove that sec square theta + cos square theta can never be less than 2

Answer 1

using AM - GM

AM ≥ Gm

cos²θ + sec²θ / 2 ≥  √ cos²θ sec²θ
⇒  cos²θ + sec²θ ≥ 2         hence proved

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Answer 2

here is your answer....

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