a. When using implicit differentiation, in the formula for % it is always necessary to eliminate y to get a formula purely in terms x. True v b. Use implicit differentiation to find the xcoordinate of the point(s) on the curve: x2+y2=1%xy with horizontal tangent lines. If there is more than one answer, separate your answers by commas. x: c. When performing implicit differentiation, we don't need to worry about the possibility of having a denominator equal to 0. v