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[" 20.If "y=sin x" " and "u=cos x" then ...

[" 20.If "y=sin x" " and "u=cos x" then "(dy)/(du)" is equal to "],[[" (a) "-cosec x" ."cos x],[" (b) "(pi)/(180)cosec x^(*)" cos "x],[" (c) "-(pi)/(1一v)cosec x" ."cos x''],[" (d) None of these "]]

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