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If f(theta)=|(cos^2theta,costhetasinthet...

If `f(theta)=|(cos^2theta,costhetasintheta,-sintheta),(costhetasintheta,sin^2theta,costheta),(sintheta,-costheta,0)|`,there `f(pi/3)+f((2pi)/3)+f(pi)+f((4pi)/3)++f((npi)/3)` is equal to
(a)`n` (b) `(n(n+1))/2` (c) `n^2+2n` (d) `2n^2-n`

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