SOLUTION: Given sinA = 4/5 and cosB = -12/13 and (where 90<A<180 and find: a.) Cos(A-B) b.) Tan(A-B)

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Question 1145036: Given sinA = 4/5 and cosB = -12/13 and (where 90 a.) Cos(A-B)
b.) Tan(A-B)
Answer by Alan3354(69443) About Me  (Show Source):
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Given sinA = 4/5 and cosB = -12/13 and (where 90 a.) Cos(A-B)
b.) Tan(A-B)
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Look up "Half Angle Formulas" on Wikipedia.