If angle $A$ lies in the second quadrant and $\sin A = \frac{3}{4},$ find $\cos A.$
Question:
If angle $A$ lies in the second quadrant and $\sin A = \frac{3}{4},$ find $\cos A.$
Answer:
Let's think step by step.

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-\frac{\sqrt{7}}{4}
If angle $A$ lies in the second quadrant and $\sin A = \frac{3}{4},$ find $\cos A.$
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