Mathematics

If $$f(x)=\begin{vmatrix} \cos { x }  & 1 & 0 \\ 1 & 2\cos { x }  & 1 \\ 0 & 1 & 2\cos { x }  \end{vmatrix}$$ then $$\displaystyle\int _{ 0 }^{ \pi /2 }{ f\left( x \right) } dx$$ is equal to 


ANSWER

$$1/4$$


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Single Correct Medium Published on 17th 09, 2020
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