trigonometric finite series equals to polynomial function
15045
Proving $\sum\limits_{l=1}^n \sum\limits _{k=1}^{n-1}\tan \frac {lk\pi }{2n+1}\tan \frac {l(k+1)\pi }{2n+1}=0$
37040
Prove reduction formula for $\int \cos^n (x)\sin^m (x) \, dx$
127547
Prove that If $f$ is polynomial function of even degree $n$ with always $f\geq0$ then $f+f'+f''+\cdots+f^{(n)}\geq 0$.
91388
Prove that $f$ is a polynomial if one of the coefficients in its Taylor expansion is 0
33100
Trigonomnetric equality involving tg
139019
Polynomial satisfying $f(x) = f'(x) \cdot f''(x)$
140221
Product of two power series
34060
Laurent Series of $f(z) = \sin {\frac{1}{z}}$ at $z=0$
33396
Generalizing a Trig Identity
14836
A polynomial sequence
139113
Does the series $\sum \sin^{(n)}(1)$ converge, where $\sin^{(n)}$ denotes the $n$-fold composition of $\sin$?
9944
Fourier series identity
141645
Trigonometric series sum proof
65435
Ring of trigonometric functions with real coefficients
54374
Alternating Series Using Other Roots of Unity
65901
Solution verification to complex analysis problem, prove $f$ is a polynomial.
48977
Polynomials having as roots the sum (respectively, the product) of two algebraic elements