solve: sin-1x+ sin-1(1-x) = cos-1x
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https://www.meritnation.com/ask-answer/question/find-the-value-of-x-sin-1x-sin-1-1-x-cos-1x/inverse-trigonometric-functions/7265893
https://www.meritnation.com/ask-answer/question/find-the-value-of-x-sin-1x-sin-1-1-x-cos-1x/inverse-trigonometric-functions/7265893