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What is the simplified value of (sin x − sin^3 x) / cos^2 x?

Answer and explanation

Correct answer: sin x

The governing concept is the Pythagorean trigonometric identity sin^2 x + cos^2 x = 1. Factor the numerator: sin x − sin^3 x = sin x(1 − sin^2 x). Using 1 − sin^2 x = cos^2 x, the expression becomes [sin x · cos^2 x]/cos^2 x. Whenever cos x is not zero, cos^2 x cancels, leaving sin x. Therefore option C is correct. The restriction cos x ≠ 0 is necessary because the original expression would be undefined when cos x = 0. The alternatives cos x, tan x, and sec x do not follow from the factorisation and identity; they result from using an incorrect identity or cancelling incorrectly.

Related tags

MathematicsTrigonometryTrigonometric-IdentitiesAlgebraic-SimplificationTrigonometric Functions And Their PropertiesTrigonometric FunctionsClass 12 Mcq

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