求函数y=(√3 cosx) (2 sinx )的最值
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解题思路:考查三角恒等变换解题过程:varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prcedu.com/include/read
y=x-sinx/2cosx/2y=x-sin(x/2)cos(x/2)=x-(1/2)sinxdy/dx=1-(1/2)cosxy=x^3+3^xy=x^3+3^x,y'=3x^2+3^xln3
y=sinxcosx-cos^2x=1/2sin2x-1/2(1+cos2x)=1/2(sin2x-cos2x-1)=1/2[√2*sin(2x-派/4)-1]=√2/2*sin(2x-派/4)-1/
就是简单的复合函数求导问题嘛.1.y'=[1/cos(10+2x)]*[-sin(10+2x)]*2=[-2sin(10+2x)]/cos(10+2x)2.y'=[1/cos(3+x²)]*
y=(sin²x+cos²x)+(√3/2)(2sinxcosx)+cos²x=1+(√3/2)sin2x+(1+cos2x)/2=(√3/2)sin2x+(1/2)co
sin3x=sin(x+2x)sin^3x=(sinx)^2*sinx(sinx)^2=(1-cox2x)/2sin3x*sin^3x化简得0.5*(cos2x-2(cos2x)^2+1)*((1-c
∵y=cosx+cos(x-π3)=cosx+cosxcosπ3+sinxsinπ3=32cosx+32sinx=3(cosπ6cosx+sinπ6sinx)=3cos(x-π6),∵-1≤cos(x
1.将cos(2x-π/3)看成整体√cos(2x-π/3)的导数是1/[2√cos(2x-π/3)]将2x-π/3看成整体cos(2x-π/3)的导数是-sin(2x-π/3)2x-π/3的导数是2
y=sinx+√3cosx=2sin(x+π/3)最小正周期为2π最大值为2,最小值为-2
y=cos^2x+sinx=1-2(sinx)^2+sinx=-2(sinx-1/4)^2+9/8因为|x|
应该是cosx≥1/2x∈[2kπ-π/3,2kπ+π/3](k∈Z)sin²x
y=3sin²x-2√3sinxcosx+3cos²x+2cos²x=1-√3sin2x+cos2x-1+1=cos2x-√3sin2x+2=2(cosπ/3*cos2x
y‘=3cos²x*(cosx)'=3cos²x(-sinx)=-3sinxcos²x【数学的快乐】团队wdxf4321为您解答!
y=3cosX-cos(2X)=3cosx-(2*(cosx^)2-1)=-2(cosx)^2+3cosx+1=-2(cosx-3/4)^2+17/8当cos=3/4时,y有最大值,为17/8当cos
y'=-sin(4-3X)*(-3)=3sin(4-3X)
y=sinx+cos(π-x)=sinx-cosx(sinx、cosx的系数为1,√2²=1²+1²)=√2×√2/2×sinx-√2×√2/2×cosx=√2×(sin
你的答案错误.因为-60度
由x-π3∈[2kπ,2kπ+π],可得x∈[π3+2kπ , 4π3+2kπ](k∈Z),∴函数y=cos(x-π3)的单调递减区间是[π3+2kπ , 4π
根号下大于等于0,真数大于0所以sinx>=√3/2=sin(2kπ+π/3)=sin(2kπ+2π/3)所以2kπ+π/3
y=4cos(x/3)得出:x=3arccos(y/4)∴反函数为:y=3arccos(x/4)反函数的定义域就是原函数的值域,0