If y = $\sum\limits_{k = 1}^6 {k{{\cos }^{ - 1}}\left\{ {{3 \over 5}\cos kx - {4 \over 5}\sin kx} \right\}} $, then ${{dy} \over {dx}}$ at x = 0 is _______.

Question

If y = $\sum\limits_{k = 1}^6 {k{{\cos }^{ - 1}}\left\{ {{3 \over 5}\cos kx - {4 \over 5}\sin kx} \right\}} $,

then ${{dy} \over {dx}}$ at x = 0 is _______.

Correct Answer

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