Question #89e00
2 Answers
Explanation:
Let's say that we have
Thus, using the definitions of cosine and tangent, we have
Using trig identity, we get -->
Since A is acute, therefor, cos A is positive.
Let's say that we have
Thus, using the definitions of cosine and tangent, we have
Using trig identity, we get -->
Since A is acute, therefor, cos A is positive.