Proof that the number e > 2 and e < 3

Note on natural logarithm integral

Note on square root of 2

Pythagorean theorem

Estimation of mean and variance

Estimation of mean and variance
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Solving the integral ∫(ln(cos x))/(cos² x) dx

Note on product of functions derivative (f(x)g(x))'

Note on square impulse Fourier transform

Solving the integral ∫exp(-ax²)cos(µx)dx in (-∞, ∞)

Integration trigonometric substitution examples

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