Finding the Values of (Theta): Solving cos2theta = 1/4

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To solve the equation cos(2θ) = 1/4 within the interval 0° ≤ θ ≤ 180°, it is suggested to first sketch a graph of the function to visualize potential solutions. The graph will indicate two possible values for θ. After identifying these points, a calculator can be used to find the precise values. The answers should be rounded to the nearest integers. This approach combines graphical analysis with numerical calculation for an effective solution.
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Homework Statement


Find the values of (theta),in the interval 0degree\leq(theta)\leq180,for which cos2theta=1/4.Give your answers correct to the nearest integers.

Homework Equations


:s


The Attempt at a Solution


do i just tap them in the calculator or how?
 
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I would start by sketching a graph of the function first. You should be able to see that there are two possible values of theta. Then sure, use your calculator to find them.
 

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