Suppose that and B are acute angles such that cos (a) = 4/5 and tan (B) = 15/8 Compute the following. Enter exact answers;

Question

Suppose that and B are acute angles such that cos (a) = 4/5 and tan (B) = 15/8
Compute the following. Enter exact answers; decimal approximations will be marked incorrect.
(a) sin(a + B)
(b) cos(a + B)
(c) sin(2a)

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