The slope of the tangent to the curve \( y=\cos ^{-1}(\cos x) \) at \( x=-\pi / 4 \) is (a) 1 (b...

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The slope of the tangent to the curve \( y=\cos ^{-1}(\cos x) \) at \( x=-\pi / 4 \) is
(a) 1
(b) 0
(c) 2
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