(2018•山东)若坐标原点(0,0)到直线x-y+sin2θ=0的距离等于\( \frac{\sqrt{2}}{2}\)，则角θ的取值集合是 ( )
A.\( \left\{\theta |\theta =k\pi \pm \frac{\pi }{4},k\in z\right\}\)
B.\( \left\{\theta |\theta =k\pi \pm \frac{\pi }{2},k\in z\right\}\) C.\( \left\{\theta |\theta =2k\pi \pm \frac{\pi }{4},k\in z\right\}\) D.\( \left\{\theta |\theta =2k\pi \pm \frac{\pi }{2},k\in z\right\}\)
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，求数列{bn}的前n项和Tn． 
