7.
\((1)\)已知向量\(\overset{}{a}\),\(\overset{}{b}\),若\(\overset{}{a}\)在\(\overset{}{b}\)方向上的投影为\(3\),\(\left| \overset{}{b} \right|{=}2\),则\(\overrightarrow{a}\cdot \overrightarrow{b}=\)__________.
\((2)\)若函数\(f(x)=\sin \pi x,x\in [\dfrac{1}{3},\dfrac{5}{6}]\),则\(f(x)\)的值域为___________.
\((3)\)已知\(\cos (\dfrac{\pi }{6}-\alpha )=\dfrac{2}{3}\),则\(\sin (\alpha -\dfrac{2\pi }{3})=\)__________.
\((4)\)若函数\(f(x)=\dfrac{2{{(x+1)}^{2}}+\sin x}{{{x}^{2}}+1}\)的最大值和最小值分别为\(M\)、\(m\),则函数\(M+m=\)_______.