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[" 30) "7sin^(2)theta+3cos^(2)theta=4 pi...

[" 30) "7sin^(2)theta+3cos^(2)theta=4 pi sec theta+csc theta(pi)/(3)arctan(7)/((sqrt(3))/(2))],[[" (A) "(2)/(sqrt(3))-2" (B) "(2)/(sqrt(3))," (C) "(2)/(sqrt(3))+2," (D) "(sqrt(3))/(2)]]

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