求函数f(x)=sin^4x+cos^4x+sin^2xcos^2x/2-2sinxcosx-1/2sinxcosx+1/4cos^2x求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/(2-2sinxcosx)-(1/2sinxcosx)+(1/4cos^2x)的最小正周期,最大值和最小值!
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![求函数f(x)=sin^4x+cos^4x+sin^2xcos^2x/2-2sinxcosx-1/2sinxcosx+1/4cos^2x求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/(2-2sinxcosx)-(1/2sinxcosx)+(1/4cos^2x)的最小正周期,最大值和最小值!](/uploads/image/z/1332999-63-9.jpg?t=%E6%B1%82%E5%87%BD%E6%95%B0f%28x%29%3Dsin%5E4x%2Bcos%5E4x%2Bsin%5E2xcos%5E2x%2F2-2sinxcosx-1%2F2sinxcosx%2B1%2F4cos%5E2x%E6%B1%82%E5%87%BD%E6%95%B0f%28x%29%3D%28sin%5E4x%2Bcos%5E4x%2Bsin%5E2xcos%5E2x%29%2F%282-2sinxcosx%29-%281%2F2sinxcosx%29%2B%281%2F4cos%5E2x%29%E7%9A%84%E6%9C%80%E5%B0%8F%E6%AD%A3%E5%91%A8%E6%9C%9F%2C%E6%9C%80%E5%A4%A7%E5%80%BC%E5%92%8C%E6%9C%80%E5%B0%8F%E5%80%BC%21)
求函数f(x)=sin^4x+cos^4x+sin^2xcos^2x/2-2sinxcosx-1/2sinxcosx+1/4cos^2x求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/(2-2sinxcosx)-(1/2sinxcosx)+(1/4cos^2x)的最小正周期,最大值和最小值!
求函数f(x)=sin^4x+cos^4x+sin^2xcos^2x/2-2sinxcosx-1/2sinxcosx+1/4cos^2x
求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/(2-2sinxcosx)-(1/2sinxcosx)+(1/4cos^2x)的最小正周期,最大值和最小值!
求函数f(x)=sin^4x+cos^4x+sin^2xcos^2x/2-2sinxcosx-1/2sinxcosx+1/4cos^2x求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/(2-2sinxcosx)-(1/2sinxcosx)+(1/4cos^2x)的最小正周期,最大值和最小值!
先化简.
f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/(2-2sinxcosx)-1/2sinxcosx+1/4cos^2x
=【(sin²x+cos²x)²-sin²xcos²x】/(2-sin2x)-1/4*sin2x+1/4*(1+cos2x)/2
=(1-1/4*sin²2x)/(2-sin2x)-1/4*sin2x+1/8+(cos2x)/8
=1/4(4-sin²2x)(2-sin2x)-1/4*sin2x+1/8+(cos2x)/8
=1/4(2+sin2x)-1/4*sin2x+1/8+(cos2x)/8
=(5+cos2x)/8.
则f(x)的最小正周期是π,最大值是(5+1)/8=3/4,
最小值是(5-1)/8=1/2.