Calculus
The operation for differentiation with respect to x
What is d/dx
The line perpendicular to the tangent line at a point
What is the Normal
The derivative of a^x
a^x ⋅ ln(a)
The notation for the second derivative of y with respect to x
What is d^2y/dx^2 or y''
The Product Rule of Differentiation
What is d(f(x)g(x))/dx = f'(x)g(x) + f(x)g'(x)