fix arraylist_insert_at

Add

bool + TRUE, FALSE
greater_epsilon to check |num|>e
deg_to_rad for converting degrees to radians
taylor_sin_deg for sin(degrees) by taylor series expansions
taylor_sin_rad for sin(radians) by taylor series expansions
taylor_exp_notxx for exp^{-x^{2}}

Fix #include directives

Update README.md