Sometimes the calculator detects that an equation is too complicated to plot perfectly in a reasonable amount of time. When this happens, the equation is plotted at lower resolution.
Unresolved Detail In Plotted Equations

Morgan Daugherty sin(x^2)+sin(y^2)=0
Utter madness 
Infinite Planes sin(x/y  y/x)=0

Sean Budds \tan \left(\operatorname{arcsinh}\left(1x^{\operatorname{arccoth}\left(\frac{\csc \left(\operatorname{nPr}\left(x,5\right)\right)}{1\cdot y^{\left(\operatorname{arccsc}\left(y+1\right)\right)}}\right)}y\right)\right)=\operatorname{arctanh}\left(\sin \left(x\left(y^{\left(x\sin 5x\right)}\right)\right)\right)
...

Sean Budds \tan \left(\sin x^2\right)=\arctan \left(\sin y^2\right)

Mateo Zaki y=20cos(2/7x)tan(y!^x!)sin(1/3y)

Mateo Zaki It's a queso turkey surprise!

Cldonkin 
Vigneshanand06 y^{2}=\left\left(3x\right)\right^{3x}
f\left\left(xy\right)\right=\left(x^{\frac{2y}{x}\cdot f}\right)
NOTE: Add a slider to f in the second one.
\frac{\sin xxxxyyyyy}{\frac{\sin x}{\sin y}}=y
\left(\sin \left(xy\left(\tan \left(x\right)\cdot \cos \left(y\right)\right)\right)\right)=y
\frac{\left(\sin \left(xy\left(\tan \left(x\right)\cdot \cos \left(y\right)\right)\right)\right)}{\sin \left(x^{\frac{x}{y}}\right)}=y

Vigneshanand06 https://www.desmos.com/calculator/wm6djsyczg
play the slider to see movement

Mrei6641 x^y=\cos \left(x\right)
if you zoom out, beware of lag(bad pc's)

 Aylizior  I saw a recurring pattern of basically sinx=siny here... so I took that and built a holy pattern of greatness:
$\tan \left(\frac{1x}{\cos \left(y\right)}\right)\le \tan \left(\frac{1y}{\cos \left(x\right)}\right)$

Lawrence Tran 
Lawrence Tran y=x!^{\sin \left(\frac{y}{\sqrt{\tan \left(x\right)}}\right)}
Is cool.

Kacper Słomiński x=sin(x^y) y=cos(y^x)

Allendan001 \left\operatorname{round}\left(y!\right)+\operatorname{floor}\left(x!\right)\right=\operatorname{ceil}\left(xy!\right)

Xinli Dai the Pi Guy try y^a=sin(xb) or any other function

Xinli Dai the Pi Guy like this:

Josh Sherman 8\cdot x^{\log 9^x}=\ \ln y just kills it

Ping Yu The effect of this unresolved detailing issue made a red cross logo for me!
Copy and paste to help spread Red Cross!

Jamestolliver (p)cos((x^2)(sin(y^2)))=(q)cos((y^2)(sin(x^2)))
 p and q are sliders  press play and watch the lag

Ahmed Shaikha send to me your calculator breaking equations
look for graphs called crazy

Pedro Et Cetera \sin \left(\cos \left(\tan \left(x^y\right)\right)\right)=\sin \left(\cos \left(\tan \left(y^x\right)\right)\right)

Pedro Et Cetera I compiled A bunch found on this thread and a few of my own, all of them are hidden and turn them on at your own risk. My computer could handle about 6 or 7 before it started lagging but not all computers are the same

Grhumphrey20 
Grhumphrey20 $\left(\log _x\left(\tan \left(y^x\right)\right)\right)^{\frac{\operatorname{sign}\left(\sin \left(x^{\sin \left(y\right)}\right)\right)}{\sqrt[\cos x]{\operatorname{sign}\left(x^{y\sin \left(x\right)}\right)}}}=0.5$

Xklein 2021 Square root of xy = x^y is one

Xinli Dai the Pi Guy I just broke desmos: sinx^y=y^sinx

Sjii1829 i think i broke desmos even more https://www.desmos.com/calculator/4oyilidgdu

Ahmed Shaikha i don't need repeats of those already given. the graph is already lagging like crasy

Liueri \left(\sin x\right)^{\left(\cos y\right)}=\left(\cos x\right)^{\left(\sin y\right)} would make a nice wallpaper...
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