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Calc II · Taylor Series
No antiderivative for e^(-x²)? Use its Maclaurin series: ∫₀¹ e^(-x²) dx ≈ 0.7475, error < 0.001
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Algebra II · Polynomial & Rational Inequalities
Solve x³ - 4x² - 5x ≥ 0 and (x - 4)/(x + 1) ≥ 2 by sign chart. Swipe for every step.
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Calc II · Volumes of Revolution
Spin the region under y = x − x² about the x-axis, y-axis, and x = 2: π/30, π/6, π/2
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Algebra II · Complex Numbers
Solve x² − 6x + 13 = 0, multiply, divide with the conjugate & simplify i⁴⁷. Swipe for every step.
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Algebra II · Complex Numbers
Solve x² − 6x + 13 = 0, multiply, divide with the conjugate & simplify i⁴⁷. Swipe for every step.
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Calc II · Arc Length
Length of y = x²/8 − ln x on [1, e]? 1 + (y′)² is a perfect square, so L = (e² + 7)/8
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Algebra II · Binomial Theorem
Find the 4th term, the x⁴ coefficient & a constant term without expanding. Swipe for every step.
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Calc II · Partial Fractions
Integrate (3x+5)/((x−1)(x+1)²), then evaluate from 2 to 3. Get 2ln(3/2) − 1/12?
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Algebra II · Systems of Equations
Solve a 3×3 system by elimination: x+y+z=6, 2x−y+z=3, x+2y−z=2. Swipe for every step + the check.
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Calc III · Polar Double Integrals
Evaluate ∬ e^(-(x²+y²)) dA over the disk x²+y² ≤ 4. Bonus: the Gaussian integral = √π.
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Precalculus · Law of Cosines
Triangle ABC: b=5, c=8, A=60°. Find a, B, C, the area & the altitude from A. Swipe for steps.
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