T_n( cos(theta) ) = cos(n theta) where T_n is the nth Chebyshev polynomial of the first kind.
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This is weird. Subscript n has been in since version 6.0, back in 2010: https://unicode.org/charts/PDF/Unicode-6.0/U60-2070.pdf …
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In fact it looks like the superscripts and subscripts block hasn't been updated since 6.0
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