Is there an alternative form/identity for $\prod_{k=1}^{m} \cos(2^kx)$?
32792
Proving: $\cos A \cdot \cos 2A \cdot \cos 2^{2}A \cdot \cos 2^{3}A ... \cos 2^{n-1}A = \frac { \sin 2^n A}{ 2^n \sin A } $
156597
Proving a reduction formula for the antiderivative of $\cos^n(x)$
51842
Simplify $\prod_{k=1}^5\tan\frac{k\pi}{11}$ and $\sum_{k=1}^5\tan^2\frac{k\pi}{11}$
32183
A "fast" way for  computing $ \prod \limits_{i=1}^{45}(1+\tan i^\circ) $?
29018
Do the BAC-CAB identity for triple vector product have some intepretation?
50050
A formula for the power sums: $1^n+2^n+\dotsc +k^n=\,$?
78033
Evaluating $\prod_{n=1}^{\infty}\left(1+\frac{1}{2^n}\right)$
89523
Infinite product $(1+z)\prod_{n=1}^{+\infty}(1+z^{2^{n}})$
107090
Motivation for/history of Jacobi's triple product identity
145279
Compute the (multiplicative) inverse of $4x+3$ in the field $\frac {\Bbb F_{11}[x]}{\langle x^2+1 \rangle}$?
146762
Closed form for $\sum_{k=0}^{n} \binom{n}{k}\frac{(-1)^k}{(k+1)^2}$
23727
How can I deduce $\cos\pi z=\prod_{n=0}^{\infty}(1-4z^2/(2n+1)^2)$?
47670
Algebraic proof of $\sum_{i=0}^k{{n \choose i}{m \choose {k-i}}}= {{m+n}\choose k}$
117200
Evaluation of $ \sum_{k=0}^n \cos k\theta $
63155
Express $1+2\cos a$ as a product
62072
Is $2+2=4$ an identity?
23919
Trying to evaluate $\prod_{k=1}^{n-1}(1-e^{2k\pi i/n})$ for my complex analysis homework