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What is \(\tan(\pi-\theta)\) equal to?

Answer and explanation

Correct answer: \(-\tan\theta\)

The tangent subtraction identity is \(\tan(A-B)=\frac{\tan A-\tan B}{1+\tan A\tan B}\), where defined. More simply, tangent has period \(\pi\) and is odd under sign reversal: \(\tan(\pi- heta)=\tan(-\theta)=-\tan\theta\). Hence option D is correct. The same result follows from quadrant signs: the angle \(\pi- heta\) lies in the second quadrant when \(0<\theta<\pi\), where sine is positive and cosine is negative, so their ratio is negative. Option A ignores the sign change; B and C replace tangent by its reciprocal, cotangent.

Related tags

Trigonometric-FunctionsAngle-TransformationTangentTrigonometric Functions Of Sum And Difference Of Two AnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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