alleryBecause P lies on the unit circle, cos squared x plus sin squared x equals:
AOne
BZero
CTwo
DTen
Answer & Solution
Correct answer: A. One
1. The point P is one unit from the origin.
2. Its coordinates satisfy a squared plus b squared equals one.
3. So cos squared x plus sin squared x equals one.
_Source: syllabus Mathematics, Chapter 3, Trigonometric Functions._
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