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[" DaMPLE "22" If "f(x)=|cos x-sin x|," ...

[" DaMPLE "22" If "f(x)=|cos x-sin x|," then "f'(pi/4)" is equal to "],[[" (a) "sqrt(2)," (b) "-sqrt(2)," (c) "0," (d) none of these "]]

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