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

Answer and explanation

Correct answer: (1)

The direct answer is option D, \(1\). A basic identity connects secant and tangent: \(\sec^2x=1+\tan^2x\), wherever these functions are defined. Subtract \(\tan^2x\) from both sides: \(\sec^2x- an^2x=1\). Option A, 0, would incorrectly treat the two terms as equal. Option B, \(\sin x\), is unrelated to this fixed identity and is not constant. Option C, 2, results from an invalid addition or sign mistake. Option D is correct because the difference is exactly the constant 1. This identity follows from \(\sec x=1/\cos x\), \(\tan x=\sin x/\cos x\), and \(\sin^2x+\cos^2x=1\). Exam cue: remember \(\sec^2x-\tan^2x=1\).

Related tags

Trigonometric-IdentitiesSecantTangent

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