exam Maths Puzzle Numerical Ability

Can you please explain how I could go about solving this problem?

1.3 x 10^-12 / 2

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5/x + 6/x^2 - 4 - 3x / 2 - x I have this problem and I need to solve it using Identies, but it also has restrictions such as theta is more than or equal to zero and theta is less than or equal to 360 the equation is this 4cos(squared, theta)-1=0