87/1000, how to linearize a multi-variable function, calculus 3

86/1000, the small-angle approximation, sinθ≈θ

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85/1000, why is the integral of 1/x = ln(x)+C?

90/1000, integral of tan(x) in a different way (without writing tan(x) as sin(x)/cos(x))

88/1000, 1-1/2+1/3-1/4+...=? (alternating harmonic series)

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