\((1)\sin {20}^{0}·\cos {10}^{0}-\cos {160}^{0}·\sin {10}^{0}= \)____________.
\((2)\)如图,函数\(y=f(x) \)的图象在点\(P\)处的切线方程是\(y=-2x+9 \),则\(f(4)+f{{{'}}}(4) \)的值为__________.
\((3)\)在极坐标系中,直线\(ρ\cos θ- \sqrt{3}ρ\sin θ-1=0 \)与圆\(ρ=2\cos θ \)交于\(A\),\(B\)两点,则\(\left|AB\right| =\)__________.
\((4)\)已知定义在\(R\)上的函数\(f(x),g(x) \)满足\(\dfrac{f(x)}{g(x)}={a}^{x} \),且\(f{{{'}}}(x)g(x) < f(x)g{{{'}}}(x) \),\(\dfrac{f(1)}{g(1)}+ \dfrac{f(-1)}{g(-1)}= \dfrac{5}{2} \),若有穷数列\(\left\{ \dfrac{f(n)}{g(n)}\right\}(n∈{N}^{*}) \)的前\(n\)项和等于\(\dfrac{31}{32} \),则\(n\)等于_____.