Add time function for animation, time(0) is timer to count from 0 to 60.
+time(0) moving to left.
sin(x+time(0))
-time(0) moving to right.
sin(x-time(0))
sine function run after cosine function.
cos(x-time(0))+1 and sin(x-time(0))-1
tangent rides on sine function at x=0.
sin(x+time(0)) and cos(time(0))*x+sin(time(0))
heart moving
polarplot(sin(x-time(0))-1)
flower grows up.
polarplot(sin(4*x)*time(0)/10)
