math (1112) - Calc: tangents & normals

the last bit of introductory calculus O.O

time flies when you're having fun.

we know how to work out the tangent of a curve at a certain point already, correct?

its basically the derivative of the function, when subbing the x coordinate into where x is.

that will give us the tangent.

and to get the normal

we remember that

m1 x m2 = -1

where the m's are the gradients of the tangent and normal

that's the rule for perpendicular lines with COORDINATE GEOMETRY which i must.. re-go over