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What is the value of (\cos 90^\circ)?

Answer and explanation

Correct answer: 0

From the standard trigonometric values, \(\cos 90^\circ=0\). On the unit circle, the x-coordinate of the point at \(90^\circ\) is 0, and this coordinate represents cosine. The value 1 is \(\cos 0^\circ\), so it is not correct here. Exam tip: Memorise the standard trigonometric values at \(0^\circ, 30^\circ, 45^\circ, 60^\circ\), and \(90^\circ\).

Related tags

Trigonometric FunctionsCosineStandard AnglesUnit CircleClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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