math.acos (x) Returns the arc cosine of x (in radians).

luaL_checkoption[-0, +0, v] int luaL_checkoption (lua_State *L, int arg,

math.cos (x) Returns the cosine of x (assumed to be in radians).

math.huge The float value HUGE_VAL, a value larger than any other numeric value.

luaL_opt[-0, +0, e] T luaL_opt (L, func, arg, dflt); This macro is defined as follows:

lua_tostring[-0, +0, m] const char *lua_tostring (lua_State *L, int index); Equivalent to

pairs (t) If t has a metamethod __pairs, calls it with t as argument and returns the first three results from the call. Otherwise

lua_gettop[-0, +0, –] int lua_gettop (lua_State *L); Returns the index of the top element in the stack

luaL_where[-0, +1, m] void luaL_where (lua_State *L, int lvl); Pushes onto the stack a string

debug.upvalueid (f, n) Returns a unique identifier (as a light userdata) for the upvalue numbered n from the given function. These unique identifiers allow