Question: Given that cosA = - 4/5 and sinB = -8/17 and that A and B lie in the same quadrant, find the value of: a.

Given that cosA = - 4/5 and sinB = -8/17 and that A and B lie in the same quadrant, find the value of:

a. sin(A + B)

b. cos(A + B)

c. tan(A − B)

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