If sin(α) =8/17 where 0 < a <π/2 and cos(β) = 5/13 where 3π/2 < β < 2π. Find sin(α+β), cos(α-β), and tan(α-β). How do you find these values?

alex2016-11-08T20:18:47Z

hints:
cos(α) =15/17
tan(α) =8/15
sin(β) =-12/13
tan(β) =-12/5

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