@chapter Expression Evaluation
@c man begin EXPRESSION EVALUATION
-When evaluating an arithemetic expression, Libav uses an internal
+When evaluating an arithmetic expression, Libav uses an internal
formula evaluator, implemented through the @file{libavutil/eval.h}
interface.
@item ld(var)
Allow to load the value of the internal variable with number
-@var{var}, which was previosly stored with st(@var{var}, @var{expr}).
+@var{var}, which was previously stored with st(@var{var}, @var{expr}).
The function returns the loaded value.
@item while(cond, expr)