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Reduce power to the 1st powers of sin(nx) and cos (mx): cos^4 (x) =? Could someone please help me find the LCD of this rational expression as well as the solution? 4/(x+1)+1/x=15/(2x)? Find a power series representation for f(x)=ln(x^2 +3). please show details :) thanks!? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x? Find the indicated limit, if it exists. lim f(x), x approaches 9 {x+9 , x < 9} { 27-x , x>9}?