So I'd say go with textbook, followed by google, followed by your prof. Bear in mind that you DO NOT look like an idiot if you walk into office hours for help. Profs are lonely. You get knowledge and brownie points .
Calc, I've tried the text, bleh, google sucks as well, but that's google. Wolfram is okay, but not to helpful either. I'll be in office hours tomorrow, just the thing is my professor has been absent for the lasy 3 weeks, so I haven't been able to see him previously.
I was going to say, office hours where the student/teacher ratio is way better always yielded the most knowledge for me. Plus, you build a personal relationship with the teacher, and they're more likely to feel sympathetic toward your grades.
Here in Finland they take schooling very seriously and have one of the best teacher student ratios in the world.(even in kiddies school)
Thats why almost every one here is an engineer and knows 3 languages.