A beautiful identity of $\sin(x)$
9986
Prove $ \sin(A+B)\sin(A-B)=\sin^2A-\sin^2B $
97213
Why does $\sin(0)$ exist?
131140
Understanding ProofWiki's proof of differentiation of sine power series
117113
Integration of $x^2 \sin(x)$ by parts
57750
Solve identity: $\frac {\sin x}{1-\cos x} = \frac {1+\cos x}{\sin x}$
7296
Prove $(1-\cos x)/\sin x = \tan x/2$
125566
The Identity Theorem for real analytic functions
116580
Prove by induction: $\sin{x}+\sin{3x}+\dots+\sin{(2n-1)x}=\frac{\sin^2{nx}}{\sin{x}}$
80680
General term of Taylor Series of $\sin x$ centered at $\pi/4$
103376
Is $\sin(p \pi/q)$ necessarily an algebraic number?
158279
$\int_0^{\pi/2}\ln(\sin(x))$?
91521
Ambiguity of notation: $\sin(x)^2$
7492
Is there a formula for $\sin(xy)$
143857
How to prove absolute summability of sinc function?
149447
Proving $\sin (x)=\cos (90^\circ-x)$
108872
Residues of $z^2\sin(\frac{1}{z})$
144188
Prove that $\cos(z)$ and $\sin(z)$ are surjective over the complex numbers.