Limits of cosine and sine
1331
Approximation of the Sine function near $0$
88432
A problem on range of a trigonometric function: what is the range of $\frac{\sqrt{3}\sin x}{2+\cos x}$?
23238
Linear combinations of sine and cosine
106867
Limit of $\cos(x)/x$ as $x$ approaches $0$
45728
Proving a limit of a trigonometric function: $\lim_{x \to 2/\pi}\lfloor \sin \frac{1}{x} \rfloor=0$
108918
Can someone explain this trigonometric limit?
15330
Double limit of $\cos^{2n}(m! \pi x)$ at rationals and irrationals
156610
To prove the limit of $\frac{x^2+2\cos x-2}{x\sin^3 x}$ at zero is $1/12$
68835
Trigonometric limit: Dividing the Numerator and Denominator by $\theta\;?$
12841
Ratio of sines given, find ratio of cosines?
68136
$\lim\limits_{x\to 0} \frac{\tan x - \sin x}{x^3}$?
94283
Different ways finding the derivative of $\sin$ and $\cos$.
1908
Compute $ \lim\limits_{n \to \infty }\sin \sin \dots\sin n$
79684
Finding $\lim \limits_{x \to 0} \frac{1 - \cos x}{x}$, given $\lim \limits_{x \to 0} \frac{\sin x}{x} = 1$
11744
Maximum and minimum of $f(x)=\cos(\sin(x))-\sin(\cos(x))$
142114
Limit as $x\to 2$ of $\frac{\cos(\frac \pi x)}{x-2} $
139386
Limits of trigonometric functions: $\lim _{x\to \pi } \frac{\cos(x/2)}{\pi ^2-x^2}$