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Trig sum: $\tan ^21^\circ+\tan ^22^\circ+\cdots+\tan^2 89^\circ = \text{?}$

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#algebra-precalculus #trigonometry #summation
90
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Evaluating a sum by applying geometry

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#geometry #summation
73
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Showing the Summation of $(\frac{w}{2})^k$ where w is a complex root

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#complex-numbers #summation #geometric-series
163
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Minimizing sum of products

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#summation #products #np-complete
86
Views

Another Summation

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#sequences-and-series #summation
628
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A formula for $\lfloor n\rfloor+\left\lfloor \frac n2\right\rfloor+ \left\lfloor \frac n3\right\rfloor+\ldots+\left\lfloor \frac nk\right\rfloor$?

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#calculus #summation #ceiling-and-floor-functions
91
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Give a combinatorial proof for $\sum_{k=1}^n k{n\choose k}=n\cdot 2^{n-1}$

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#combinatorics #summation
82
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Infinite sum question

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#calculus #summation
209
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Find the closed form of an n-sum

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#sequences-and-series #summation
692
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Estimating sum with binomial coefficients

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#summation #binomial-coefficients
507
Views

Finding a sum of alternating cubes

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#summation
921
Views

Partial sum formula of a polynomial series?

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#sequences-and-series #polynomials #summation #infinity
96
Views

Rewrite $\sum_{n\ge0}{z^{kn}}$ to $\sum_{n\ge0}{f(n,k)z^n}$

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#sequences-and-series #summation
3.6k
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Proof of Equation by Well Ordering Principle

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#real-analysis #summation #induction
33
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sum polylogarith convergence

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#summation

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