Let \( f(x)=\sin x-\cos ^{2} x \). If \( f(x)= \) a has atleast one...

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Let \( f(x)=\sin x-\cos ^{2} x \). If \( f(x)= \) a has atleast one solution in \( \left[0, \frac{\pi}{2}\right] \), then find the number of
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