Where must one use $x=A \cos \omega t$ and $x=A \sin \omega t$?
2673
Which equation to use for SHM
55436
Why does $A\sin{k(x+c)}=a\sin{kx}+b\cos{kx}$ imply that $A=\sqrt{a^2+b^2}$ and $\tan{c}=-b/a$?
94283
Different ways finding the derivative of $\sin$ and $\cos$.
138729
What happens when $\lvert\omega\rvert =1$?
11744
Maximum and minimum of $f(x)=\cos(\sin(x))-\sin(\cos(x))$
105774
How is $ \cos (\alpha / \beta) $ expressed in terms of $\cos \alpha $ and $ \cos \beta $?
108642
$e^A$, where $A= \begin{bmatrix} 0 & \omega \\ -\omega& 0 \end{bmatrix}$
9246
Calculating $\prod (\omega^j - \omega^k)$ where $\omega^n=1$.
7492
Is there a formula for $\sin(xy)$
60230
Prove that $\frac{1+\sin\theta+i\cos\theta}{1+\sin\theta-i\cos\theta}=\sin\theta+i\cos\theta$
127380
Use vectors to prove $\cos(\beta - \alpha) = \cos \alpha \cos\beta + \sin\alpha \sin\beta$
21881
Prove that $\forall\alpha\geq\omega$, $|L_\alpha|=|\alpha|$ without AC
148624
Replacing Tan[x] with Sin[x]/Cos[x]
34918
Difference between $R^\infty$ and $R^\omega$
126701
How to prove that $d \sin(x)/dx = \cos(x)$ without circular logic such as L'Hôpital's rule?
87620
Different definitions of trigonometric functions
6465
How to prove periodicity of $\sin(x)$ or $\cos(x)$ starting from the Taylor series expansion?