If sin $\alpha$ and $\cos\alpha$ are the roots of the equations $ax^2 + bx + c = 0,$ then $b^2 =$
- A$a^2 - 2ac$
- ✓$a^2 + 2ac$
- C$a^2 - ac$
- D$a2 + ac$
Answer: B.
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Answer: B.
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