$mg\cos\theta=N$ or $N\cos\theta=mg$
97768
Why is $R\cos{a} = mg$ in circular motion compared and not $R = mg\cos{a}$?
158210
showing $\arctan(\frac{2}{3}) = \frac{1}{2} \arctan(\frac{12}{5})$
17188
Simplify $\cos(n \pi)$ and $\sin(n \pi)$ when n is an integer
60709
How do I get $\cos{\theta} \lt \frac{\sin{\theta}}{\theta} \lt 1$?
72377
Show that $\sum_{n=1}^\infty r^n\cos(n\theta)=\dfrac{r\cos\theta -r^2}{1-2r\cos\theta+r^2}$ whenever $0<r<1$.
84420
When is $\sin(x) = \cos(x)$?
62474
If $AB=I_n$ and $BA=I_m$ then $n=m$.
55869
Use the Maclaurin series to prove that $e^{i\theta} = cos(\theta) + isin(\theta)$
53364
dim$(V)$ = $n$, dim$(W)$ = $m$ $\implies$ dim($L(V,W)$) = $nm$
130542
Every natural number $n$ can be written as $n=s-t$ with $\omega(s)=\omega(t)$
9479
$\sum \cos$ when angles are in arithmetic progression
88124
$M,N\in \Bbb R ^{n\times n}$, show that $e^{(M+N)} = e^{M}e^N$ given $MN=NM$
113675
Question about theta of $T(n)=4T(n/5)+n$
33396
Generalizing a Trig Identity
120444
Trigonometric Triangle Equality
145463
How to factorise $2 \sin^2θ – 3\sinθ +1 = 0$
103701
Fundamental Theorem of Trigonometry