exam Maths Puzzle Numerical Ability

How would you write this rational expression in lowest terms?

a^2-9/18-2a^2

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exam Other Question

Pove that
1+sin(theta)divided by 1-Sin(theta)- 1-Sin(theta) Divided by 1+Sin(theta)=
4Tan(theta)times Sec(theta)
Show step by step how to change the left side of the equation to equal the right side of the equation. How do you graph the equation 4x-3y=-9???