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-1 $begingroup$ What are prerequisites for studying Cohomology Operations (or for studying Mosher & Tangora 's book on Cohomology Operations)? algebraic-topology homology-cohomology cohomology-operations share | cite | improve this question asked Jan 6 at 18:28 Hili Hili 72 8 $endgroup$ 1 $begingroup$ This is quite subjective. What usually works

0 $begingroup$ How to calculate $$int_2^4 frac{sqrt{ln(9-x)}}{sqrt{ln(9-x)} + sqrt{ln(3+x)}} spacemathrm{d}x$$ definite-integrals share | cite | improve this question edited Jan 6 at 20:52 amWhy 1 asked Jan 6 at 17:25 Adil Anderson Adil Anderson 6 2 $endgroup$ closed as off-topic by RRL, amWhy, A. Pongrácz, Gibbs, egreg Jan 6 at 22:53