f(x) = sin x + cos 2x, (x > 0) has minima for x =

1
\(\rm \frac{n\pi}{2}\)
2
\(\rm \frac{3(n+1)\pi}{2}\)
3
\(\rm \frac{(2n+1)\pi}{2}\)
4
nπ 
5
Not Attempted

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