The number of real solutions of the equation \( -x^{2}+x-1=\sin ^{4} x \) is (A) 1 (B) 2 (C) 0 (...

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The number of real solutions of the equation \( -x^{2}+x-1=\sin ^{4} x \) is
(A) 1
(B) 2
(C) 0
(D) 4
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