You wrote them correctly in your first question. Since they are all proper nouns, as a rule, they should always be capitalized.
we no longer have to stress our minds with written math !! go for the un-explored !! no...not string theory ! waste of time !!
Calculus and Computer Science, are proper nouns so they should be capitalize. go here, http://www.usingenglish.com/glossary/pro...
If they describe some-thing -like 'Maths teacher', 'Calculus home-work' then they become a Proper noun as they are part of the NAME of that thing.
If they are just a word alone like 'I don't like caculus' they can use a lower case or upper case initial letter
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