Rational value of sine
55302
Rational values of trigonometric functions
145500
Finite Series - reciprocals of sines
44400
$e^{2\pi i x} = (e^{2\pi i})^x$: What happens if x is rational?
57152
Solve $\sin x = 1 - x$
122169
Prove $\sin(\pi/2)=1$ using Taylor series
84420
When is $\sin(x) = \cos(x)$?
62522
Sine is algebraically less than cosine in given interval.
9658
What is the length of a sine wave from $0$ to $2\pi$?
52018
Can $\frac{\sqrt{3}}{\sin20^{\circ}}-\frac{1}{\cos20^{\circ}}$ have two values?
7492
Is there a formula for $\sin(xy)$
99328
Value of $\sin (2^\circ)\cdot \sin (4^\circ)\cdot \sin (6^\circ)\cdots \sin (90^\circ) $
107067
Finding the argument of $z=1-\cos(2\theta)-i\sin(2\theta)$
123867
Solve $(a + b\sin(x))\sin(x) = p$ for $x$
154080
circular reasoning in proving $\frac{\sin x}x\to1,x\to0$
29424
Maximum value of $\sin A+\sin B+\sin C$?
63804
Proof that every repeating decimal is rational
5947
Limit of a trigonometric rational expression