已知函数 f(x)= a ? b ,其中 a = (2cosx, 3 sinx) , b =(cosx,-2cosx) . (1)求函数f(x)在区间 [0, π 2 ] 上的单调递增区间和值域; (2)在△ABC中,a、b、c分别是角A、B、C 的对边,f(A)=-1,且b=1△ABC的面积 S= 3 ,求边a的值.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【简答题】用并列连词将两个句子合成一个并列句 1. He was tired. He went to bed. 2. He made a promise. He didn’t keep it. 3. Mary is opening the door. Tom is greeting her guests. 选择适当的词填空。 1. I _______ (saw have seen) her yester...
【简答题】Which person chose a book to read on holiday almost by chance? 1...... was reunited with a long-lost sister not long ago? 2...... was somehow pred from having an accident? 3...... married an anti...