y=(4-3sin x)(4-3cos x)最小值
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 12:30:54
x)05.Sgsnڰ&H;JLK*PB5@b AM4'lK4tu2zԹA{:ʐ3q\ e3KhjmKTI0PTH&僤F%&@WiÌɎ]@G`逈XΆ'M 1# p
y=(4-3sin x)(4-3cos x)最小值
y=(4-3sin x)(4-3cos x)最小值
y=(4-3sin x)(4-3cos x)最小值
y=(4-3sin x)(4-3cos x)
=16-12sinx-12cosx+9sinxcosx
=16-12(sinx+cosx)+9sinxcosx
令sinx+cosx=t(-√2≤t≤√2)
(sinx+cosx)^2=sinx^2+cosx^2+2sinxcosx=1+2sinxcosx
sinxcosx=(t^2-1)/2
原式=16-12t+9(t^2-1)/2
=16-12t+9t^2/2-9/2
=9t^2/2-12t+23/2
=9/2(t-4/3)^2+7/2
因为4/3∈[-√2,√2]
所以最小值为7/2
求y=sin^5x ,y=cos(4x+3) 的导数,
y=2cos(x/4+ π/3)-3sin(x- π/4)y=sin(4x- π/3)-cos(3x+π/2)
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
y=sin^2x-3sinxcosx+4cos^2x是否等于y=sin^2x+cos^2x+3cos^2x-3/2*sin2x?y=sin^2x-3sinxcosx+4cos^2xy=sin^2x+cos^2x+3cos^2x-3/2*sin2x=1+3cos^2x-3/2*sin2x=1+3(1-sin^2x)-3/2*sin2x=-3sin^2x-3/2*sin2x+4
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)
化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)
已知点p(x,y)为曲线C:{x=3sinθ 4cosθ y=4sinθ-3cosθ上动点若不等式x m
y =(cos^2) x - sin (3^x),求y'
两圆x=-3+2cosθ y=4+2sinθ x=3cosθ y=3sinθ 的位置关系
求函数y=cos(9/2π+x)+sin^2x的最大值和最小值还有一题 已知sinx+cosx=1/2,求sin^3x+cos^3x和sin^4x+cos^2x
y=4sin(3x+(π/4))+3cos(3x+(π/4)),求周期
y=(4-3sin x)(4-3cos x)最小值
函数y=3sin(x/3)+4cos(x/3)的最大值.
y=sin^4x+2√3 sinxcosx-cos^4x 化简
y=cos^4x-sin^4x的周期是 3Q
y=sin(x+7派/4)+cos(x-3派/4)
y=sin(2x-π/4)+cos(3x+π/3)的导数
求y=2sin(x/2)-3cos(3x/4)的最小正周期