Direction: Read the following text and answer the following questions...
Principal Value of Inverse Trigonometric Functions
Introduction:
Inverse trigonometric functions are the inverse functions of trigonometric functions. They are used to find the angle measures corresponding to given trigonometric ratios. The principal branch refers to the values of the inverse trigonometric functions that lie within a specific range.
Principal Value:
The principal value of an inverse trigonometric function is the value that lies within the range of the principal branch. In other words, it is the value of the inverse trigonometric function that is considered as the primary or principal value. For example, the principal value of sin^(-1)(1) is denoted as sin^(-1)(1) and represents the angle whose sine is 1.
Finding the Principal Value of sin^(-1)(1):
To find the principal value of sin^(-1)(1), we need to determine the angle whose sine is 1. The sine function takes values between -1 and 1, inclusive. Therefore, we need to find the angle in the principal branch whose sine is 1.
Determining the Angle:
We know that the sine function is positive in the first and second quadrants. In the first quadrant, the sine function is positive and equal to 1 at π/2 radians or 90 degrees. Therefore, sin^(-1)(1) = π/2.
Finding the Principal Value of sin^(-1)(1/√2):
To find the principal value of sin^(-1)(1/√2), we need to determine the angle whose sine is 1/√2. The sine function takes values between -1 and 1, inclusive. Therefore, we need to find the angle in the principal branch whose sine is 1/√2.
Determining the Angle:
We know that the sine function is positive in the first and second quadrants. In the first quadrant, the sine function is positive and equal to 1/√2 at π/4 radians or 45 degrees. Therefore, sin^(-1)(1/√2) = π/4.
Conclusion:
The principal value of sin^(-1)(1) is π/2 and the principal value of sin^(-1)(1/√2) is π/4. Therefore, the correct answer is option C) 3π/4.
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