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December 21, 2014

Homework Help: Math

Posted by Linds on Wednesday, October 25, 2006 at 9:45pm.

calculus help needed
example: sin-1(-1/2)
how do you figure this out?


The sin^-1 means the arcSin, or the angle whose sine is ...

so sin^-1(1/2) is the angle whose sine is -.5, which is -30 degrees.

In your calculator, put in -.5, then press INV sin.


so as my answer do i put pi/6?


That is the answer in radians. It should be negative. There is an angle in the third quadrant that yields a sine of -1/2 also.

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