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 已知a=(√3,cosx),b=(cos²x,sinx)函数f(x)=ab√3/2 来源：学生作业帮 编辑： 作业帮 分类： 数学作业 时间： 1110 求f（x）单调递增区间Divide the equation by 2 Hence you get √3/2 cos theta 1/2 sin theta = (1/√2) That is sin 60 Cos theta cos 60 Sin theta =(1/√2) Sin (60 theta) = 1/√2 Sin 135 = 1/√2 = sin 45 Hence theta =(a) 3 – √5 / 2 (b) 3 √5 / 2 (c) 2 / 3 – √5 (d) 2 / 3 √5 1) a and d 2) d only 3) b only 4) None of these Solution (1) a and d tan (1 / 2 If Cos A B 3 2 And Sin A B 3 2 Find A And B Where A B And A B Are Acute Angles Sarthaks Econnect Largest Online Education Community 3+2 cos theta