If sin^(-1)(x) + cos^(-1)(x) = π/2, then the value of x is:

Practice Questions

Q1
If sin^(-1)(x) + cos^(-1)(x) = π/2, then the value of x is:
  1. 0
  2. 1
  3. -1
  4. 1/2

Questions & Step-by-Step Solutions

If sin^(-1)(x) + cos^(-1)(x) = π/2, then the value of x is:
Correct Answer: Any value in the range [-1, 1]
  • Step 1: Understand the functions involved. sin^(-1)(x) is the inverse sine function, and cos^(-1)(x) is the inverse cosine function.
  • Step 2: Recall the property of these functions. The equation sin^(-1)(x) + cos^(-1)(x) = π/2 is a known identity in trigonometry.
  • Step 3: Recognize the domain of the functions. The values of x for which these functions are defined are between -1 and 1, inclusive.
  • Step 4: Conclude that since the equation holds true for all x in the domain, x can be any value from -1 to 1.
  • Inverse Trigonometric Functions – The relationship between the inverse sine and inverse cosine functions, specifically that their sum equals π/2 for any x in the domain [-1, 1].
  • Domain of Functions – Understanding the valid input range for the inverse sine and cosine functions, which is limited to the interval [-1, 1].
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