For example the slope in cartesian plane is nothing but tanA where A is the angle made by a straight line with respect to X-axis. Slope at any poing on the curve is given by drawing a tangent at that point and the slope of the tangent gives the slope of the curve at that point. But in space(3d geometry) how can we draw a tangent to a curve and with respect to which axis?What is the slope(gradient) of a curve in 3dimensional geometry?
the answer is pie over 2x plus 7
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