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Questions  >>  CBSE XI  >>  Math  >>  Trigonometric Functions
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Q)

Given $x > 0$,the value of $f(x)=-3\cos \sqrt{3+x+x^2}$ lie in the interval _________

$\begin{array}{1 1}(A)\;-3,3&(B)\;-2,2\\(C)\;-1,1&(D)\;-4,4\end{array} $

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