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  1. B

    Inverse trig derivatives

    Differentiate y= cos^(-1)(1-x^2)/(1+x^2) Thanks :D
  2. B

    Rates and Finance

    Thanks got it! :D
  3. B

    Rates and Finance

    Ron put $500 savings into a Bank for 2 years, where it earned interest at 6% per p.a, paid twice a year. Here what do they mean by "paid twice a year" :| thanks
  4. B

    99.90 + State rank | Exam responses + free notes [Eco, Chem, Phys]

    Can I get a sample for Chemistry please? (production of materials preferred) :) planning to buy
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