- How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help?

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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)).? Can anybody tell me what's the Chaos Theory math equation? Can any one graph y=-2x+4 using x and y intercept? How do you do this math question?
http://prntscr.com/8xzwq7? For what integer value of x is 2x-9<5 and x-1>4?