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[" 17.If "f(x)=(1-cos x)/(1-sin x)" ,the...

[" 17.If "f(x)=(1-cos x)/(1-sin x)" ,then "f'((pi)/(2))" is cqual to "],[[" (a) "1," (b) "0],[" (c) "alpha," (d) does not exist "]]

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