# Math Help - find the expression

1. ## find the expression

hello
for $x \in \mathbb{R}$ find an expression of $Arcsin(sin(x))$ without using trigonometric functions.
(i only need hints )
thanks a lot.

2. Originally Posted by Raoh
hello
$\forall x \in \mathbb{R}$ find an expression of $Arcsin(sin(x))$ without using trigonometric functions.
(i only need hints )
thanks a lot.
$\arcsin{\sin{x}} = x + 2\pi n, n\in \mathbf{Z}$.

3. thanks for your reply,but we only have $\forall x\in \left [ \frac{-\pi}{2},\frac{\pi}{2} \right ],Arcsin(sin(x)) = x$,am i right ?

4. Originally Posted by Raoh
thanks for your reply,but we only have $\forall x\in \left [ \frac{-\pi}{2},\frac{\pi}{2} \right ],Arcsin(sin(x)) = x$,am i right ?
Yes

5. ok,thanks
for $x\in \mathbb{R}$ we have $Arcsin(sin(x)) = x$

6. Raoh, i have plotted its graph, any comments? just double click the graph and it will enlarge for better viewing