| http://www.w3.org/ns/prov#value | - I suggest you think about what each of those problems looks like, i.e. if you are integrating a product where one term looks like the derivative of the other it should push you to try a substitution, if you are integrating a product of two unrelated functions perhaps it should be tackled with parts, if you have a term that looks like $\sqrt{a^2 - b^2}$ you should recognise Pythagoras and try a trig
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