Why Cos(-A) is always CosA..?
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Answered by
1
Answer:
According to trigonometric ratios sin (-A) = sinA, then why does cos (-A)=cosA? ... C means cos and it's reciprocal sec is positive in 4th quadrant . Let's answer your question. Sin(-A) = -SinA ,coz A lies in 4th quadrant.
Answered by
3
Answer:
cos (-A) is always cosA because -A is a negative angle which lie in quadrant 4
Step-by-step explanation:
So as we know that Cos and sec are always positive in 4th quadrant that's why cos(-A) is always positive
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