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[Frama-c-discuss] A problem with math functions

> [wp} user error: Builtin \cos(real) not defined
> [wp] failure: Logic \cos undefined.

We simply did not implement all built-ins in WP.
One reason is that many SMT solvers (if not all) lack interesting properties about trigonometry.

 - either use another name, like ‘cos’, and declare it using standard ACSL « logic real cos(real x); » within an axiomatic bloc, and add desired axioms and lemmas ;
 - or use a WP driver (WP manual § 2.4.10, p28) to bind `\cos` to some symbol in  your favorite SMT solver (or Coq or Why3) ; for instance, see how we handle the ‘\max’ function in '$(frama-c -print-share-path)/wp/wp.driver’

In all cases, consider using -wp-model float