The area of the region R is bounded by y=(cos x +2)^-1/2 x=0,x=π/2 and the x axis .Use the trapezium rule with ordinates x=0,x=π/4 and x=π/2 to show that R is approximately π/16[√2+4(2-√3)^1/3 +2]

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First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.