The following are all angle measures (in radians, rounded to the nearest hundredth) whose cosine is 0.32 .Which is the principal value of cos−1(0.32) ?Choose 1 answer:(A) −5.04(B) 1.25(C) 7.53(D) 13.81
Q. The following are all angle measures (in radians, rounded to the nearest hundredth) whose cosine is 0.32 .Which is the principal value of cos−1(0.32) ?Choose 1 answer:(A) −5.04(B) 1.25(C) 7.53(D) 13.81
Definition of Inverse Cosine Function: The principal value of the inverse cosine function, cos−1(x), is the angle in radians between 0 and π for which the cosine is x. Since 0.32 is positive, the principal value will be in the first quadrant.
Determine Principal Value: To find the principal value of cos−1(0.32), we can use a calculator or a computer to compute the inverse cosine of 0.32.
Calculate Inverse Cosine: Using a calculator, we find that cos−1(0.32)≈1.241 radians when rounded to the nearest hundredth.
Identify Closest Value: Looking at the options provided, the value that is closest to 1.241 radians and falls within the range of 0 to π is 1.25 radians. Therefore, the principal value of cos−1(0.32) is (B) 1.25.
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