alleryThe cosine arose from the need to find the sine of the:
ARight angle itself
BComplementary angle
CSupplementary angle
DReflex angle here
Answer & Solution
Correct answer: B. Complementary angle
1. Cosine is literally the sine of the co-angle.
2. That co-angle adds with A to make 90 degrees.
3. It is the complementary angle.
4. So the answer is the complementary angle.
_Source: syllabus Mathematics, Ch 8 'Introduction to Trigonometry'_
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