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For the graph of the function \(y=-\cos x\), what is the value of \(y\) when \(x=0\)?

Answer and explanation

Correct answer: -1

Substituting \(x=0\) gives \(y=-\cos 0=-1\), since \(\cos 0=1\). Option B omits the negative sign and gives the value of \(\cos 0\), not \(-\cos 0\). Exam tip: evaluate the standard trigonometric value first, then apply any sign outside the function.

Related tags

GraphsCosine FunctionsTrigonometric ValuesReflectionDomainRangeAnd Graphs Of Trigonometric FunctionsDomain Range And Graphs Of Trigonometric FunctionsTrigonometric FunctionsMathematics

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