allerycos squared A plus sin squared A equals:
AA
B1
C0
D2
Answer & Solution
Correct answer: B. 1
1. Start from the Pythagoras relation in the right triangle.
2. Divide through by the square of the hypotenuse.
3. The result is cos squared A plus sin squared A equals 1.
_Source: syllabus Mathematics, Chapter 8, Introduction to Trigonometry._
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