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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There's a special place in hell for people who promulgate lazy syntax - particularly academics. 
That recently screwed me over in an assignment where they wrote ln 2/τ, but meant ln(2)/τ
But they should!
They should be.
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