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numbers and algebraic expressions
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limits of sequences and functions
derivative and integral of functions
trigonometry
plane geometry
analytic geometry
solid geometry
combinatorics
probability
elements of statistics
kropki game

When calculate the limits of sequences or functions can obtain the indeterminate forms: 0/0, ∞/∞, 0 * ∞, ∞ - ∞, -∞ + ∞, 1^∞, 0^0, ∞^0. The indeterminate form can equals various numbers or negative, positive infinity. Can not give based on it one solution. Only what can do that calculate the limit from beginning. In such way that not obtain the indeterminate form.