If sin $\alpha$ and $\cos\alpha$ are the roots of the equations $ax^2+ bx + c = 0,$ 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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