Question: Given that sin(a) = and cos(b) = - with a and b both in the interval 2) 7 , find the exact values of sin(a

Given that sin(a) = and cos(b) = - with a and b both in the interval 2) 7 , find the exact values of sin(a + b) and cos(a - b). sin(a + b) = cos(a - b) =

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