Curves: gradient: the trig curve y=asin x Move the sliders to move the red line or the curve. The gradient of a trig curve changes as you move along the curve, so it does not have any one fixed value. But you can find the gradient at a point on the curve by drawing a straight line that just touches the curve at that point. This line is called a tangent line and is shown above in red. The gradient of this line tells you the gradient of the curve at the point selected. controls