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What is tan(π/2 − x) equal to?

Answer and explanation

Correct answer: cot x

The governing concept is the complementary-angle, or cofunction, identity. Express tangent as a quotient of sine and cosine: tan(π/2 − x) = sin(π/2 − x) / cos(π/2 − x). The complementary-angle identities give sin(π/2 − x) = cos x and cos(π/2 − x) = sin x. Therefore tan(π/2 − x) = cos x / sin x = cot x, wherever the expressions are defined. Thus option B is correct. Option A incorrectly treats tangent as unchanged, while options C and D introduce a negative sign that does not arise in this complementary-angle transformation. A negative sign would be associated with a different identity, such as tan(π − x) = −tan x.

Related tags

Cofunction-IdentitiesTangentCotangentTrigonometric FunctionsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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