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Question Number 108628 by I want to learn more last updated on 18/Aug/20

Prove that the inequality  ∣cos x∣  ≥   1  −  sin^2 x    hold true for all  x ∈ R

Provethattheinequalitycosx1sin2xholdtrueforallxR

Commented by mr W last updated on 18/Aug/20

∣cos x∣≤1  ⇒∣cos x∣≥cos^2  x=1−sin^2  x

cosx∣⩽1⇒∣cosx∣⩾cos2x=1sin2x

Commented by I want to learn more last updated on 18/Aug/20

Thanks sir, i appreciate.

Thankssir,iappreciate.

Commented by I want to learn more last updated on 18/Aug/20

please sir help with   Q 108626

pleasesirhelpwithQ108626

Commented by Aziztisffola last updated on 18/Aug/20

look at the answer to get an idea.

lookattheanswertogetanidea.

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