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Question Number 103921 by Rio Michael last updated on 18/Jul/20
Prove that ∀ x ∈ R^� , ∣ cos x ∣ ≤ 1 − sin^2 x
Provethat∀x∈R¯,∣cosx∣⩽1−sin2x
Answered by Worm_Tail last updated on 18/Jul/20
cosx=(√(1−sin^2 x )) ∣cosx∣= (√(1−sin^2 x)) ≤1−sin^2 x ∣cosx≤1−sin^2 x
cosx=1−sin2x∣cosx∣=1−sin2x⩽1−sin2x∣cosx⩽1−sin2x
Commented by Rio Michael last updated on 18/Jul/20
perfect sir thanks
perfectsirthanks

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