[" 1) If "sin x+cos x=sqrt(2)cos x" ,the...

[" 1) If "sin x+cos x=sqrt(2)cos x" ,then "cos x-sin x" is equal to "],[[" (a) "sqrt(2)cos x," (b) "sqrt(2)sin x],[" (c) "sqrt(2)(cos x+sin x)," (d) None of these "]]

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