[" 9.If "sin theta+cos theta=sqrt(2)cos ...

[" 9.If "sin theta+cos theta=sqrt(2)cos theta" then "cos theta-sin theta" is equal to "],[[" (a) "sqrt(2)cos theta," (b) "sqrt(2)sin theta],[" (c) "sqrt(2)(cos theta+sin theta)," (d) none of these "]]

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