exam Maths Puzzle Numerical Ability

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

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exam Other Question
write the equation of each parabola.
focus(10,0); directrix x=-10 How do you detemine the range of the function y=-2x+x when the domain is {1,3,5}