If

Code:

sin^4(\[Alpha])/x+cos^4(\[Alpha])/y-1/(x+y)==0

^^^^(it looked fine in mathematica...can someone tell me how to write code in this forum?)

then what is *here [alpha] is a constant*

well i figured out dy/dx and it came out to be but the book says ,which is a constant. Does this mean the above line represents a straight line??Mathematica plotted a pair of lines(i guess) and i cannot ask mathematica to find(if its possible to find (dy/dx) from implicit equations in mathematica then tell me!)

Thanks!