Apply the trigonometric identity: $\sin\left(\theta \right)$$=\sqrt{1-\cos\left(\theta \right)^2}$, where $x=\frac{\pi}{2}x$
$\sqrt{1-\cos\left(\frac{\pi}{2}x\right)^2}$
Final answer to the problem
$\sqrt{1-\cos\left(\frac{\pi}{2}x\right)^2}$
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Simplification of trigonometric expressions consists of rewriting an expression with trigonometric functions in a simpler form. To perform this task, we usually use the most common trigonometric identities, and some algebra.