求解一函数向量结合的题,急已知向量A=(sinx,3/2),B=(cosx,-1).(1)当A//B时,求2cos平方x-sin2x的值(2)求f(x)=(A+B)乘以B在〔负二分之徘,0]上的单调区间,并说明单调性.(向量那个粗体字母我打不出来,
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![求解一函数向量结合的题,急已知向量A=(sinx,3/2),B=(cosx,-1).(1)当A//B时,求2cos平方x-sin2x的值(2)求f(x)=(A+B)乘以B在〔负二分之徘,0]上的单调区间,并说明单调性.(向量那个粗体字母我打不出来,](/uploads/image/z/10218504-48-4.jpg?t=%E6%B1%82%E8%A7%A3%E4%B8%80%E5%87%BD%E6%95%B0%E5%90%91%E9%87%8F%E7%BB%93%E5%90%88%E7%9A%84%E9%A2%98%2C%E6%80%A5%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8FA%3D%28sinx%2C3%2F2%29%2CB%3D%28cosx%2C-1%29.%EF%BC%881%EF%BC%89%E5%BD%93A%2F%2FB%E6%97%B6%2C%E6%B1%822cos%E5%B9%B3%E6%96%B9x-sin2x%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82f%28x%29%3D%28A%2BB%29%E4%B9%98%E4%BB%A5B%E5%9C%A8%E3%80%94%E8%B4%9F%E4%BA%8C%E5%88%86%E4%B9%8B%E5%BE%98%2C0%5D%E4%B8%8A%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B4%2C%E5%B9%B6%E8%AF%B4%E6%98%8E%E5%8D%95%E8%B0%83%E6%80%A7.%EF%BC%88%E5%90%91%E9%87%8F%E9%82%A3%E4%B8%AA%E7%B2%97%E4%BD%93%E5%AD%97%E6%AF%8D%E6%88%91%E6%89%93%E4%B8%8D%E5%87%BA%E6%9D%A5%2C)
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