Richard Feynman found trigonometry notation to be ambiguous and confusing.
"If I had sin f, it looked like s×i×n×f"
So he decided to create his own notation. See below.
What do you think?pic.twitter.com/61ByeX7LMz
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Oh yeah, just in case, it's from this video *about* notationhttps://youtu.be/sULa9Lc4pck
That’s pretty clever; but how do you remember which side is divided by which?
Sin and cos are always by the hypotenuse, tan is just memorised I guess, but it's still a kind of rise over run (opposite over adjacent, assuming the angle is on the "floor")
So what’s the notation for cot(x)?
The same triangle but now it's upside down? 
YES! I didn't get trig until I asked my maths teacher what these magic buttons on my calculator were actually doing and he demonstrated using triangles and circles on graphs. Maybe not the "magic bullet" but it's worth teaching why it works rather than just how to use something
def prefer this. not sure why more math notation doesn’t directly correspond to geometry
oh wow, this is really neat. I like how it defines the functions as well as being concise
This works great but what about cotan?
Just make a mark to mean "reciprocal of". Underline or a 1/ mark in the top left of each symbol. Or a double line to define which side is the numerator.
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