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f(x)={((1-sin^3x)/(3cos^2x), if x < pi/2...

`f(x)={((1-sin^3x)/(3cos^2x), if x < pi/2),(p, if x=pi/2),((q(1-sinx))/(pi-2x)^2, if x>pi/2))` is continuous at `x=pi/2` then `(p,q)` is: (A) `(4,1/2)` (B) ` (-1/2,4)` (C) `(4,-1/2)` (D) `(1/2,4)`

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