find the principal value of cos inverse X= y
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principal value of cos inverse x - Principal value of cos-¹(x) is 0 ≤ y ≤ π . It is used to obtain measure of an angle using its cosine function. It can be written as arccos(x) or cos-¹(x). Range of principle value of arccos(x) is 0 ≤ y ≤ π i.e. 0° ≤ y ≤ 180° .
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