Within Mythryl expressions, function application binds more tightly than anything but prefix, postfix and circumfix operators.
In particular, it binds more closely than infix operators. For example sin 0.0+1.0 is (sin 0.0)+1.0 not sin (0.0+1.0):
linux$ my eval: sin 0.0+1.0 1.0 eval: (sin 0.0)+1.0 1.0 eval: sin (0.0+1.0) 0.841470984808
This can be a trap for the unwary newcomer!
Remember: Function application binds more tightly than (almost) anything else!