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[" 0.If "x=a cos theta+b sin theta" and ...

[" 0.If "x=a cos theta+b sin theta" and "y=a sin theta-b cos theta],[" then "a^(2)+b^(2)" is cqual to "],[[" (A) "x^(2)-y^(2)," (B) "x^(2)+y^(2)],[" (C) "(x+y)^(2)," (D) "(x-y)^(2)]]

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