设函数f(x)=sin²x+sin2x+3cos²x(x∈R).(1)将函数写成f(x)=Asin(wx+p)+k(A>0,w>0,|p|
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![设函数f(x)=sin²x+sin2x+3cos²x(x∈R).(1)将函数写成f(x)=Asin(wx+p)+k(A>0,w>0,|p|](/uploads/image/z/2535228-36-8.jpg?t=%E8%AE%BE%E5%87%BD%E6%95%B0f%28x%29%3Dsin%26%23178%3Bx%2Bsin2x%2B3cos%26%23178%3Bx%28x%E2%88%88R%29.%281%29%E5%B0%86%E5%87%BD%E6%95%B0%E5%86%99%E6%88%90f%28x%29%3DAsin%28wx%2Bp%29%2Bk%28A%3E0%2Cw%3E0%2C%7Cp%7C)
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设函数f(x)=sin²x+sin2x+3cos²x(x∈R).(1)将函数写成f(x)=Asin(wx+p)+k(A>0,w>0,|p|
设函数f(x)=sin²x+sin2x+3cos²x(x∈R).
(1)将函数写成f(x)=Asin(wx+p)+k(A>0,w>0,|p|<π/2)的形式;
(2)求函数f(x)的周期;
(3)在直角坐标系中,用“五点”法作出函数f(x)在一个周期内的大致图象.
设函数f(x)=sin²x+sin2x+3cos²x(x∈R).(1)将函数写成f(x)=Asin(wx+p)+k(A>0,w>0,|p|
f(x)=sin²x+sin2x+3cos²x
=1+2cos²x+sin2x
=sin2x+cos2x
周期=π
=sin2x+1+2cos²x-1+1
=sin2x+cos2x+2
=根号2[sin(2x+45°)]