book Maths Puzzle Numerical Ability

8(4u-1)-12u=11(2u-6)

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3/4X - 2/X^2 Dear Sir/Madam,
I am confronted with the following problem:
"Which of the following are true of the function {{{ f(x) = -7sin(x/2 - pi/3) }}}?

I. The maximum value of the fu