Simplify the expression tan(sin^(-1) x). Inverse Trig Functions

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Thank you Ms. Shaw, I was really punching the air trying to figure this out, especially when it randomly shows up in a book practice exercise with no proof anywhere in the chapter.

noodle
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when using the pythagorean theorem, use a^2+b^2=c^2 instead of x, y and 1 to avoid confusion with angle y. other than that, very helpful video! thanks!

guadalupeg.
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can you explain where you got the 1 from?

eriche