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What is the simplified value of (\sin^4 x-\cos^4 x)?

Answer and explanation

Correct answer: \(\sin^2 x-\cos^2 x\)

Using the difference of squares, \(\sin^4 x-\cos^4 x=(\sin^2 x-\cos^2 x)(\sin^2 x+\cos^2 x)\). Since \(\sin^2 x+\cos^2 x=1\), the simplified value is \(\sin^2 x-\cos^2 x\). Option B is its negative, so it is not correct. Exam tip: after applying \(a^2-b^2=(a-b)(a+b)\), use the fundamental trigonometric identity.

Related tags

Trigonometric IdentitiesDifference Of SquaresTrigonometric SimplificationSine CosineGrade 11 MathematicsTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematics

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