exam Maths Puzzle Numerical Ability

The Instructor of an introductory computer course wants to make a wall chart of a computer desktop for her students. To make it as relistic as possible, she would like the desktop

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I am trying to show the result of adding two fractions.
x=times and /= divide

What are the steps to show that
u x i/2pi x (D+d)+ u x i/2pi x (D-d) is equalt to u x i x D/pi(D sq -d sq)

Hope you can help let f(x)=2x+5and find

(a) f^-1(x) and (b) 1/f(x)