\( \int\: xsec^2xdx \) is equal to \[ \begin{array} ((A)\: tanx^2+C \quad & (B)\: tanx^2+C \\ (C)\: x\: tanx - log\: sin\: x \quad & (D)\: x\: tanx + log\: cos\: x+C \end{array} \]

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