Use the value of the trigonometric function to find .

Question

Use the value of the trigonometric function to find  . ​  ​

Quizplus · Accepted Answer

Since the value of the trigonometric function is given, we can look for its corresponding angle in the unit circle. The hexadecimal value 1ddd in the given number corresponds to an angle of 221 degrees (converting to degrees by multiplying by 180/π). Adding 360 degrees (or 2π radians) to the angle gives the coterminal angle with a positive cosine value. The corresponding hexadecimal value for this angle is 1818, which is found in option C.

Use the Value of the Trigonometric Function to Find