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Given sin a= 3/4and cos b = -12/13with both angles in the 2 nd quadrant, find: (Show your work) a. sin (a+b) b. cos (a-b)

Given sin a= 3/4and cos b = -12/13with both angles in the 2^nd quadrant, find: (Show your work)

a. sin (a+b)

b. cos (a-b)

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