February 24, 2017

Homework Help: pre-calculus

Posted by Kimmie on Thursday, January 28, 2010 at 10:14pm.

If sin a = 3/5 when Pi/2<a<Pi and
cos B = -12/13 when Pi<B<3Pi/2, then what is the value of sin(a+b)?

I don't get the question... Help appreciated.

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