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like so
``` - add language identifier to highlight code ```python
def function(foo):
print(foo)
``` - put returns between paragraphs
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$\sin^2 \theta$
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lang-mma
r'[t]==Sqrt[...], thenr'[t]^2==(...), and therefore ` r'[t]r''[t]==D[(...),r]r'[t]`. $\endgroup$