1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x+π/3)) 求周期3y=3xin(2x+π/4)减区间第三题是 y=3xin(2x+π/4)减区间
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![1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x+π/3)) 求周期3y=3xin(2x+π/4)减区间第三题是 y=3xin(2x+π/4)减区间](/uploads/image/z/3996205-61-5.jpg?t=1.y%3Dcos%5E4x%2Bsin%5E4x+%E6%B1%82%E5%91%A8%E6%9C%9F+2.y%3D%EF%BC%88sin2x%2Bsin%EF%BC%882x%2B%CF%80%2F3%29%EF%BC%89%2F%EF%BC%88+cos2x%2Bcos%EF%BC%882x%2B%CF%80%2F3%EF%BC%89%EF%BC%89+%E6%B1%82%E5%91%A8%E6%9C%9F3y%3D3xin%282x%2B%CF%80%2F4%29%E5%87%8F%E5%8C%BA%E9%97%B4%E7%AC%AC%E4%B8%89%E9%A2%98%E6%98%AF+++y%3D3xin%282x%2B%CF%80%2F4%29%E5%87%8F%E5%8C%BA%E9%97%B4)
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x+π/3)) 求周期3y=3xin(2x+π/4)减区间第三题是 y=3xin(2x+π/4)减区间
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x+π/3)) 求周期
3y=3xin(2x+π/4)减区间
第三题是 y=3xin(2x+π/4)减区间
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x+π/3)) 求周期3y=3xin(2x+π/4)减区间第三题是 y=3xin(2x+π/4)减区间
1、y=(cos^2x+sin^2x)^2-2cos^2xsin^2x
=1-1/2(sin2x)^2
=1-1/4(1-cos4x)
=3/4+1/4cos4x
周期T=2pi/4=pi/2
2、y=(根3/2sin2x+1/2cos2x)/((根3/2cos2x-1/2sin2x)
=sin(2x+pi/6)/cos(2x+pi/6)
=tan(2x+pi/6)
T=pi/2
3、3y=3xin(2x+π/4)减区间
pi/2+2kpi
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