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What is cot(θ + π) equal to?

Answer and explanation

Correct answer: cot θ

The governing concept is the periodicity of the cotangent function. Since cot x = cos x/sin x, adding π changes the signs of both numerator and denominator: cos(x + π) = −cos x and sin(x + π) = −sin x. Therefore cot(x + π) = [−cos x]/[−sin x] = cos x/sin x = cot x, wherever cotangent is defined. With x = θ, cot(θ + π) = cot θ. Hence option A is correct. Options B and D incorrectly assume that adding π changes the overall sign, forgetting that both signs cancel in the quotient. Option C confuses cotangent with its reciprocal, tangent. The result expresses the period π of cotangent.

Related tags

Trigonometric-FunctionsPeriodicityCotangentIdentitiesTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematicsClass 12 Mcq

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