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Find the exact value. cos[sin^-1(2/3)+2sin^-1(-1/3)]. Do I use the formula cos(a+b)=cosacosb-sinasinb? What do I do with the 2 before sin?
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Find the exact value. cos[sin^-1(2/3)+2sin^-1(-1/3)]. Do I use the formula cos(a+b)=cosacosb-sinasinb? What do I do with the 2 before sin?
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