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i dont know thats y am asmking
You cannot, since "x equals 0" and "y equals 0" are NOT inequalities!If x and y are counts of things, or measures (such as length) which must be positive then the reason for such constraints should be obvious.
Functions and linear equations are the same in that they both deal with x and y coordinates and points on a graph but have differences in limitations, appearance and purpose. Often, functions give you the value of either x or y, but linear equations ask to solve for both x and y.
means y ????????
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)]