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What is the simplified value of \(\frac{\sec^2 x-1}{\tan^2 x}\)?

Answer and explanation

Correct answer: \(1\)

Using the identity \(\sec^2 x=1+\tan^2 x\), we get \(\sec^2 x-1=\tan^2 x\). Therefore, \(\frac{\sec^2 x-1}{\tan^2 x}=\frac{\tan^2 x}{\tan^2 x}=1\), wherever the given expression is defined. Option \(0\) is incorrect because the numerator and denominator are equal; when they are zero, the fraction is undefined rather than zero. Exam tip: Replace \(\sec^2 x-1\) directly with \(\tan^2 x\).

Related tags

Trigonometric IdentitiesSecantTangentSimplificationClass 11 MathematicsTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematics

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