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[" If "x+y=3-cos4 theta" and "x-y=4sin2 ...

[" If "x+y=3-cos4 theta" and "x-y=4sin2 theta" then "],[[" (A) "x^(4)+y^(4)=9," (B) "sqrt(x)+sqrt(y)=16," (C) "x^(3)+y^(3)=2(x^(2)+y^(2))," (D) "sqrt(x)]]" ) "fy=2

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