Evaluate the limit
limx0 (1cos2x)(x2+16)x+ 3(sin7x)x\displaystyle \lim_{{{x}\to{0}}}{\frac{{\ {\left({1}-{\cos{{2}}}{x}\right)}{\left({x}^{{2}}+{16}\right)}}}{{{x}}}}+{\frac{{\ {3}{\left({\sin{{7}}}{x}\right)}}}{{{x}}}}