Answer: (C) sec²θ
Dividing \(\sin^2\theta+\cos^2\theta=1\) by \(\cos^2\theta\) gives \(\tan^2\theta+1=\sec^2\theta\). (The identity with \(\csc^2\theta\) is \(1+\cot^2\theta=\csc^2\theta\).)
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· 24 Oct 2026
AI-verified · Oct 2026
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