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Mathematics 10 Online
OpenStudy (anonymous):

How do I know if I should use sin or sin-1

OpenStudy (turingtest):

are you looking for an angle and have an opposite side and hypotenuse of a right triangle? use sin^-1 are you looking for the length of the opposite side of a right triangle and have the angle and hypotenuse use r*sin(x) where r is the hypotenuse and x is the angle

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