Question 49 Answer and Explanation _ACT OG3 Form 3MC Math Section

Question 49 Answer and Explanation _ACT OG3 Form 3MC Math Section

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49. If tan A = $\frac{a}{b}$ , a > 0, b > 0, and 0 < A < $\frac{\pi}{2}$ , then what is cos A ?

A. $\frac{a}{b}$

B. $\frac{b}{a}$

C. $\frac{a}{\sqrt{{a}^{2}+{b}^{2}}}$

D. $\frac{b}{\sqrt{{a}^{2}+{b}^{2}}}$

E. $\frac{\sqrt{{a}^{2}+{b}^{2}}}{b}$

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation