(江苏专用)2019高考数学二轮复习专题一三角函数和平面向量第1讲三角函数的化简与求值冲刺提分作业.docx

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1第 1讲 三角函数的化简与求值1.若 sin =- ,则 sin2x的值为 . (x+4) 452.已知 tan =- ,则 tan 的值为 . (x-4) 12 (2x-4)3.(2018江苏苏州期中)已知 tan =2,则 cos2 的值是 . ( -4)4.(2018江苏高三检测)已知 f(x)=cos ,若 f()= ,则 sin= . (x2-4) 135.已知 00,所以 00,所以 02 ,又 为锐角,2所以- 2- ,所以 2-= .2 2 3

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