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If \(\tan x=2\), what is the value of \(\frac{1-\tan^2 x}{1+\tan^2 x}\)?

Answer and explanation

Correct answer: \(-\frac{3}{5}\)

Given \(\tan x=2\), we get \(\tan^2x=4\). Hence, \(\frac{1-\tan^2 x}{1+\tan^2 x}=\frac{1-4}{1+4}=\frac{-3}{5}=-\frac{3}{5}\). The value \(\frac{3}{5}\) results from a sign error in the numerator. Exam tip: square the given trigonometric value first, then substitute carefully in both numerator and denominator.

Related tags

Trigonometric FunctionsTangentDouble Angle IdentitiesAlgebraic SubstitutionClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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