# A geometry problem by Akshat Sharda

Geometry Level pending

If $$\cos^2 x-a\sin x+b=0$$ has only one solution in $$[0,\pi]$$, then which are correct?

$$A. \ \ a\in (-\infty,-2]\cup (-1,\infty)$$

$$B. \ \ a≠b$$

$$C. \ \ a=b$$

$$D. \ \ b\in (-\infty,-2]\cup (-1,\infty)$$

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