alleryFor a point P with coordinates a and b on the unit circle, cos x equals:
Aa plus b
Ba times b
CThe a value
DThe b value
Answer & Solution
Correct answer: C. The a value
1. The angle x is measured from the positive x-axis to OP.
2. The two coordinates of P define the two functions.
3. The x-coordinate a is cos x.
_Source: syllabus Mathematics, Chapter 3, Trigonometric Functions._
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