domain of sin-1 2x
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https://www.meritnation.com/ask-answer/question/what-is-the-domain-of-sine-inverse-2x/inverse-trigonometric-functions/7266223
https://www.meritnation.com/ask-answer/question/what-is-the-domain-of-sine-inverse-2x/inverse-trigonometric-functions/7266223