Question
Let $f(x)=\cos ^{2} x+\cos x+3$ then greatest value of $f(x)+4$ least value of $f(x)-9$ is equal to
Step 1
Since $f(x)$ is a trigonometric function with $\cos x$, its period is $2\pi$. Therefore, the greatest and least values of $f(x)$ will be the values on the interval $[0, 2\pi]$. Show more…
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