which book physics book is best for preparation for IIT JEE that gives concepts as well as problems
which book physics book is best for preparation for IIT JEE that gives concepts as well as problems

Let S={x:x belongs to R(√3+√2)^(x^2-4) - (√3-√2)^(x^2-4)=10}. Then n(S) is equal to-
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