- How to solve y +y=cos^2x using variation of parameters ?

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Find the indicated limit, if it exists. lim f(x), x approaches 9 {x+9 , x < 9} { 27-x , x>9}? Domain: -1, 5, 5, 6
Range: 2, 3, 3, 7
Is this a function? 144.5 rounded to it's nearest tenth? How many kilometers can you run in 22 minutes? Solve the equation 2cos(x+7pi/4)= square root of 3 ,which lie in [0,2pi) .find smallest and largest solution. Please show details ! Thanks?