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3 ways: sum Show 1+3+5+...nth term = n^2
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Difference of 2 nonconsecutive triangular numbers
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Find the equation of the tangent line to the curve x^3-3y^3+xy+21=0 at the point (1,2)
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exp integral e^x (f(x) + f'(x)) dx
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integral ∫√(x-a)/x dx
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Find dy/dx if x=a(θ-sin(θ)) & y=a(1-cos(θ))
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Doubly triangular number