Given that: \( \sin \mathrm{A}=\mathrm{a} / \mathrm{b} \), then \( \cos \mathrm{A}= \) ?
a. \( \...
Given that: \( \sin \mathrm{A}=\mathrm{a} / \mathrm{b} \), then \( \cos \mathrm{A}= \) ?
a. \( \frac{\sqrt{\mathrm{b}^{2}+\mathrm{a}^{2}}}{\mathrm{~b}} \)
b. \( \frac{\sqrt{b^{2}-a^{2}}}{b} \)
c. \( \frac{b^{2}}{a^{2}} \)
d. \( \frac{\mathrm{a}^{2}}{\mathrm{~b}^{2}} \)
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