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What is the value of \(\cos^{-1}\left(\cos 0\right)\)?

Answer and explanation

Correct answer: 0

Since \(\cos0=1\) and \(\cos^{-1}1\) is the angle in the principal range \([0,\pi]\) whose cosine equals 1, we get \(\cos^{-1}1=0\). The other choices are incorrect: \(\cos(\pi/2)=0\), \(\cos\pi=-1\), and \(-\pi\) is outside the principal range of arccos. Exam tip: When evaluating \(\cos^{-1}(\cos\theta)\), reduce or map \(\theta\) into the principal range \([0,\pi]\) and use that equivalent angle.

Related tags

Inverse Trigonometric FunctionsArccosPrincipal ValueCompositionTrigonometryClass 12Principal Value BranchMathematics

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