若函数 f(x)=sin(ωcosx)−1(ω>0)f\left( x\right) = \sin \left( {\omega \cos x}\right) - 1\left( {\omega > 0}\right)f(x)=sin(ωcosx)−1(ω>0) 在区间 (0,2π)\left( {0,{2\pi }}\right)(0,2π) 恰有 2 个零点,则 ω\omegaω 的取值范围是（ ）A. (0,π2)\left( {0,\frac{\pi }{2}}\right)(0,2π)B. (π2,3π2)\left( {\frac{\pi }{2},\frac{3\pi }{2}}\right)(2π,23π)C. (π2,5π2)\left( {\frac{\pi }{2},\frac{5\pi }{2}}\right)(2π,25π)D. (π2,+∞)\left( {\frac{\pi }{2}, + \infty }\right)(2π,+∞)