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

Answer and explanation

Correct answer: (1)

The correct answer is option D: \\(1\\). Start with the fundamental identity \\(1+\tan^2\theta=\sec^2\theta\\). Rearranging gives \\(\sec^2\theta-\tan^2\theta=1\\). Therefore option D is correct. Option A, \\(\tan\theta\\), is not a constant and is not what the identity gives. Option B, \\(\sec\theta\\), is also just one trigonometric function, whereas the squared difference simplifies to a constant. Option C, 0, would incorrectly assume the two squared terms are equal; in fact they differ by 1 wherever both are defined. Option D matches the identity directly. The expression is defined wherever \\(\cos\theta\\neq0\\), because secant and tangent must exist. Memory cue: \\(\sec^2\theta-\tan^2\theta=1\\), just as \\(1+\tan^2\theta=\sec^2\theta\\).

Related tags

Trigonometric-FunctionsIdentitySecant-Tangent

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