Differentiation of the cosine and sine power series
131140
Understanding ProofWiki's proof of differentiation of sine power series
33396
Generalizing a Trig Identity
124440
Evaluate this power series
23238
Linear combinations of sine and cosine
133913
Power series and intervals of convergence
122169
Prove $\sin(\pi/2)=1$ using Taylor series
128795
$n$th derivative of $e^x \sin x$
25569
Intuitive understanding of the derivatives of $\sin x$ and $\cos x$
104427
Sines and cosines of angles in arithmetic progression
21970
Convergence of the Power Series for $xu''+\sin(x)u=0$
128540
Formal power series coefficient multiplication
30480
Continued product in $\sin$ series
4956
Connection between Fourier transform and Taylor series
43637
Derivative of the sine function when the argument is measured in degrees
54374
Alternating Series Using Other Roots of Unity
119317
Proving the series of partial sums of $\sin (in)$ is bounded?
149895
A more convenient Fourier series