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

1.3 x 10^-12 / 2 Convert this inequality into an equation by adding a slack variable.
2x1 + 4x2 + 3x3 ≤ 100

Is this correct? 2x1 + 4x2 + 3x3 s1 = 100

Thank you so much for reviewing