February 24, 2017

Homework Help: Trigonometry

Posted by Dee on Monday, November 8, 2010 at 11:40pm.

Find the exact value of tan(a-b)

sin a = 4/5, -3pi/2<a<-pi;
tan b = -sqrt2, pi/2<b<pi

identity used is:

tan(a-b)=(tan a-tan b)/1+tan a tan b

simplify answer using radicals.

(a is alpha, b is beta)

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