Using only a calculator's $\sin$, $\cos$, $\tan$, $\cot$, $\arcsin$, $\arccos$, $\arctan$ buttons, convert $1$ to $3/\sqrt{5}$
60975
Calculating certain functions if only certain buttons on a calculator are permitted
74143
Simplifying and evaluating $\cot 70^\circ+4\cos 70^\circ$
31852
An elegant way to solve $\frac {\sqrt3 - 1}{\sin x} + \frac {\sqrt3 + 1}{\cos x} = 4\sqrt2 $
58483
Determining the general solution for the trigonometric equation $ 5\cos(x)-12\sin (x) = 13 $
139335
Use field calculator to change values from a,b,c etc. to 1,2,3 etc.?
25032
How to calculate $\theta = \arcsin\left(\frac{1}{2}\right)$ with given four function calculator?
142227
How do you round to 1 decimal place in Javascript?
60288
Why is $\arctan(x)=x-x^3/3+x^5/5-x^7/7+\dots$?
104384
Trigonometric identity: $\frac {\tan\theta}{1-\cot\theta}+\frac {\cot\theta}{1-\tan\theta} =1+\sec\theta\cdot\csc\theta$
31774
How do I typeset arbitrary fractions like the standard symbol for .5 = ½?
12841
Ratio of sines given, find ratio of cosines?
129319
Weird "hidden answer" in $2\tan(2x)=3\text{cot}(x)$
617
Find θ: $β=\arctan\frac{(R+r)·\sin(θ)-r·\sin(θ(1+\frac{R}{r}))}{(R+r)·\cos(θ)-r·\cos(θ(1+\frac{R}{r}))}$
63679
Picture/intuitive proof of $\cos(3 \theta) = 4 \cos^3(\theta)-3\cos(\theta)$?
90185
Another way to evaluate $\int\frac{\cos5x+\cos4x}{1-2\cos3x}{dx}$?
2899
Calculating a SQRT digit-by-digit?
65645
Express $w$ and $\frac1w$ for $w=\frac {\sqrt2+\sqrt3}{\sqrt5-\sqrt3}$ in the simplest form with a rational denominator