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Determine a & b so that f is continuous ...

Determine a & b so that f is continuous at `x = pi/2`
whre `f(x) = [{:((1-sin^(3)x)/(3 cos^(2)x), if, x lt pi/2),(a, if, x=pi/2),((b(1-sinx))/(pi-2x)^(2), if, x gt pi/2):}`

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