Collection of Mathematical Formulas/Trigonometry

Trigonometric identities
$$sin^2 x + cos^2 x = 1 $$ $$1 + cot^2 x = csc^2 x $$ $$1 + tan^2 x = sec^2 x $$

Basic formulas
$$ tan x = (sin x)/(cos x) $$ $$ cotx= (cosx) / (sinx) $$