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

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

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