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What is the simplified value of (\sec^2 \theta-\tan^2 \theta)?

Answer and explanation

Correct answer: (1)

Direct answer: option A, 1. The fundamental identity is \(\sec^2\theta=1+\tan^2\theta\). Rearranging gives \(\sec^2\theta-\tan^2\theta=1\). Therefore the expression simplifies to 1 wherever the trigonometric functions are defined. Option A is correct. Option B, \(\sin\theta\), is not generally 1; it changes with the angle. Option C, \(\cos\theta\), also changes with the angle and is not the fixed difference. Option D, 0, would incorrectly assume the two squares are equal, but the identity shows that \(\sec^2\theta\) is exactly one greater than \(\tan^2\theta\). One can also verify this from \(\sec\theta=1/\cos\theta\) and \(\tan\theta=\sin\theta/\cos\theta\), although the identity is quicker. Memory cue: remember the pair \(\sec^2\theta-\tan^2\theta=1\).

Related tags

Trigonometric-FunctionsSecantIdentity

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