If $\sin \alpha$ and $\cos \alpha$ are the roots of the equations $a x^2+b x+c=0$, then $b^2=$
- A$a^2-2 a c$
- ✓$a^2+2 a c$
- C$a^2-a c$
- D$a 2+a c$
Answer: B.
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Answer: B.
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