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Given that sin a = 2/7 and cos b =-(1/4) and a and b are...

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Given that sin a = 2/7 and cos b =-(1/4) and a and b are in the interval (?/2, ?), find sin(a + b) and cos (a - b).Give the exact answers. To enter the square root of a number, type "sqrt(a)". For example, type "sqrt(2)" to enter ?2.sin(a + b) =cos (a - b) =

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