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Doubly triangular number

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3 ways: trig integral ∫sin([118]) cos([118]) d[118]
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3 ways: trig integral ∫sin([118]) cos([118]) d[118]

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integral ∫1/((px-q)^2+r) dx

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Variance measured in the squares of the units for the observations.

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1st/2ways: Evaluate lim sin(5x)/sin(9x) as x tends 0

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