Algebra

How do I prove this statement?
sin^-1(sin Ø) = Ø
I can't figure out how I would go about proving it. Any help is appreciated.

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  1. Isn't it proved by definition?

    The angle whose sine is the sine of theta, is theta.

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  2. is proven by reflexive property .

    P.S. this is not algebra its trigonometry

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