10.
给出定义:设\(f{{{"}}}\left( x \right)\)是函数\(y=f\left( x \right)\)的导函数,\(f{{{"}}}{{{"}}}\left( x \right)\)是函数\(f{{{"}}}\left( x \right)\)的导函数,若方程\(f{{{"}}}{{{"}}}\left( x \right)=0\)有实数解\({{x}_{0}}\),则称点\(\left( {{x}_{0}},f\left( {{x}_{0}} \right) \right)\)为函数\(y=f\left( x \right)\)的“拐点”\(.\)已知函数\(f\left( x \right)=3x+4{\sin }x-{\cos }x\)的拐点是\(M\left( {{x}_{0}},f\left( {{x}_{0}} \right) \right)\),则点\(M(\) \()\)