73/1000, none of the terms is zero but the sum is 0, power series of sine

121/1000, derivative of sin^-1(x), implicit differentiation

37/1000, telescoping series, calculus 2

53/1000, sketching the graph of the derivative from the original function, calculus 1

114/1000, 3 rectangles under y=1/x from 1 to 2

83/1000, don't use the quotient rule

71/1000, limits from a graph

64/1000, solving dy/dx=y, separable differential equation

97/1000, how to evaluate the limit of x-sqrt(x) as x goes to infinity

92/1000, finding the critical numbers of f(x)=x^2*e^(-0.5x)

93/1000, why is the derivative 2^x equal to 2^x*ln(2)

103/1000, a calculus problem without using calculus