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Reduce power to the 1st powers of sin(nx) and cos (mx): cos^4 (x) =? 144.5 rounded to it's nearest tenth? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x? How would I sketch f(x,y) = x^2 + 9y^2 on the xy plane? I know it is a circle.? Seth earns $152 in four days. how many days will it take him to earn $532?