Multiple choice general knowledge

sin^2x+ cos^2x=

  1. 0

  2. 1

  3. 90

  4. -1

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Pythagorean identity states that sin²x + cos²x = 1 for any angle x. This is one of the fundamental identities in trigonometry derived from the unit circle definition. Options 0, 90, and -1 are incorrect values for this expression.