Collection of Mathematical Formulas/Trigonometry

Trigonometric identities

$s i n^{2} x + c o s^{2} x = 1$
$1 + c o t^{2} x = c s c^{2} x$
$1 + t a n^{2} x = s e c^{2} x$

$t a n x = (s i n x) / (c o s x)$
$c o t x = (c o s x) / (s i n x)$