Answers edited by DR

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• How to differentiate with respect to 'x' y=cos^(-1){2x √(1-x^(2))} ?
  
• Calculate total number of optical isomers in the following compound CH3(CHOH)3CH3 ??
  
• How do you solve the inequality #2| x -5| > 32#?
  
• A chemist did an experiment and mixed baking soda with vinegar. She collected CO2 in a balloon. But there was also water vapor in the balloon. If the total pressure of the gas collected was 2.76 atm and the temperature was 290C, what was pressure of CO2?