exam Maths Puzzle Numerical Ability

the derivative of y=(2=3cos[2x+pi/3]/sin[x])^3

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Hi! I need to reduce to lowest terms or rationalize.

(2(sqrt)3-1)(3(sqrt)3+4)

and

^3(sqrt)(-8x^12)

thanks in advance for the help A bag of potatoes weighing 5 pounds and 12 ounces costs $2.07. What is the cost of 1 pound of potatoes?