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If \(\sin^2 \theta+\cos^2 \theta=k\), what is the value of (k)?

Answer and explanation

Correct answer: 1

The fundamental trigonometric identity is \(\sin^2\theta+\cos^2\theta=1\). Therefore, \(k=1\). Option 2 may result from incorrectly treating both terms as individually equal to their maximum value; it is not true for every \(\theta\). Exam tip: whenever you see \(\sin^2\theta+\cos^2\theta\), replace it with 1.

Related tags

Trigonometric FunctionsTrigonometric IdentitiesPythagorean IdentityClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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