Ideally, your entire education should be one long philosophy course.
If teachers aren't there to turn you into a thinker in the first place, they aren't doing it right.
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I mean if you just broaden the term 'philosophy' as 'thinking critically' then sure. But any subject requires you to think, with math carrying the implication to do so, and literature asking you outright to do so. Philosophy as it is refers to a broad term for things as we see them or perception. Literature would involve itself with that, and quantitative structures like math are less so. I wouldn't even know how to describe philosophy in a sentence.