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4.C【命题视角】题考查求角问题和数学运算素养【解题分析】由cos5.02),得sing255 5.tan 3-2.∴tata)=tanatan3+2 1-tan. tan=11+a∈(2n)∈(0,23(02)2a+2a+845.A【命题视角】本题考查三角函数的图象与性质和直观想象素养【解题分析】T==6=2PQ∴PQ=3=4,R=43331+44.5ππ∴f()=Asin(x+)=a>0∴sin()=1++2=-∵R(0-3)在f(x)的图象上∴sn(-)=43,解得A=3…f(x)=sin(x-3)3