If \(\rm \frac{\pi}{2} is equal to

1
\(\rm \frac{\pi}{4}-\frac{x}{4}\)
2
\(\rm \frac{\pi}{2}-\frac{x}{2}\)
3
\(\rm \frac{\pi}{2}+\frac{x}{2}\)
4
\(\rm \frac{\pi}{4}-\frac{x}{2}\)

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