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Find the exact value of the expressions cos(a+b), sin(a+b) and tan(a+b) under the following conditions: cos(x)=12/13,x...

Find the exact value of the expressions cos(a+b), sin(a+b) and tan(a+b) under the following conditions:

cos(x)=12/13,x lies in quadrant 4, and sin(y)=-4/11, y lies in quadrant 3

a. cos (a+b) b.sin(a+b) c.tan(a+b)

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