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She's Sick in Bed and Somehow HE'S the One Suffering | Nande Koko ni Sensei ga!?
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A random variable X has the following parameters: E(X)=a & Var(X)=2a^2-1 a∈R
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A function f is called even if f(-x)=f(x) for ALL x in the domain of f &
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exp derivative (log f(ax+b) (g(cx+d)))^h(mx+n)
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How many chords can be drawn through 21 points on a circle?