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Bot We can only find the value of cosine for a specific angle. Therefore, we need to know the angle for which the cosine is equal to 9/20. We can use an inverse cosine function or a calculator to find this angle.
Using the inverse cosine function (cos⁻¹), we get:
cos⁻¹(9/20) ≈ 65.45 degrees
Therefore, the angle whose cosine is equal to 9/20 is approximately 65.45 degrees.