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Hey everyone! I need some help on a math problem. What is the exact value: Sin(Cos^-1(5/6)-tan^-1(1/3)).? Reduce power to the 1st powers of sin(nx) and cos (mx): cos^4 (x) =? Ho wma y kilometers run after 22 minutes? Round 71,089 to nearest hundred? How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help?