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December 18, 2014

December 18, 2014

Posted by **Katie** on Monday, March 15, 2010 at 1:09pm.

sin [2sin^-1 (-sq rt (3)/2)]

how do i answer this question? i don't know how to find the answer.

- College Math -
**Reiny**, Monday, March 15, 2010 at 4:50pmstart with sin^-1 (-√3/2)

which is 240 degrees or 300 degrees

so 2sin^-1 (-√3/2) is 480 or 600 degrees

then the sine of that ...

sin 480 = sin 120 = sin 60 = √3/2

sin 600 = sin 240 = - sin 60 = -√3/2

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