4.
已知函数\(f(x)={e}^{x}\sin x-\cos x \),\(g(x)=x\cos x- \sqrt{2}{e}^{x} \),其中\(e\)是自然常数.
\((1)\)判断函数\(y=f(x) \)在\(\left(0, \dfrac{π}{2}\right) \)内零点的个数,并说明理由;
\((2)∀{x}_{1}∈\left[0, \dfrac{π}{2}\right] \),\(∃{x}_{2}∈\left[0, \dfrac{π}{2}\right] \),使得不等式\(f({x}_{1})+g({x}_{2})\geqslant m \)成立,求实数\(m\)的取值范围.