alkoxy/anorexy come on this is not hard.
>Also , Xylophone .
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In algebra we consider x,y and z are variables.
There is none. y=5 is a straight horizontal line meaning it never crosses the x-axis Or in other words, At the x-intercept, y=0. If y=5, then y is unequal to 0. There is no x intercept.
If you have X=4, that is a vertical line. No matter what value y possesses, x is always four. X=4 when Y=0, X=4 when Y=1, X=4 when Y=-1, and so on.
y = sin(x+y) cos( x + y )[(1 + y')] = y' cos(x + y ) + y'cos(x + y ) = y' y'-y'cos( x+ y) = cos( x + y ) y'[1-cos(x+y)]= cos(x+y) y'= [cos(x+y)]/ [1-cos(x+y)]
Given two numbers, x and y their difference is |x - y|. |x - y| = x - y if X ≥ y and |x - y| = y - x if x < y