Use the slider to move point P along the y = sin x function and note the gradient of the tangent at that point.[br]A plot of the gradient of the tangent vs the x coordinate of P ie which forms coordinates of new point Q, (by tracing Q as P moves)[br]will reveal that the derivate of sin x is actually cos x.

The check boxes and sliders are relatively explanatory and intuitive to learn quickly.[br][br]Move point P using slider Px . Enable tracining of Q [br][br]Make you own hypothesis about the derivate of sin x