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Ok, Oasis1993, that helps.

Since Cos A = 3/5, this means that x = 3 and r = 5. Solve for y in the following equation:

(a)

Since Cos B = 24/25, this means that x = 24 and r = 25. Solve for y in the following equation:

(b)

For (c) and (d), use your sum-difference formulas using the information you are given and the information you found.