cosx递增区间是0到2分之派 2分之3派到2派
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 18:00:10
y=sin(2x+6分之派)单调递减:2x+π/6∈[2kπ+π/2,2kπ+3π/2]x∈[kπ+π/6,kπ+2π/3]k∈z当k=0时就是A选项选A
w>0,x∈[-π/3,π/4],则wx∈[-wπ/3,wπ/4].区间[-wπ/3,wπ/4]包含原点,而原点附近函数取到最小值-2,则需区间包含-π/2所以-wπ/3≤-π/2,w≥3/2.w的最
y=√2sin(2x+π/4)最小正周期为2π/2=π单调增区间:2x+π/4∈[2kπ-π/2,2kπ+π/2]x∈[kπ-3π/8,kπ+π/8]所以单调增区间为[kπ-3π/8,kπ+π/8]k
很简单积分号内分式上下同乘以sinX+cosX的conjugate也就是SinX-CosX那么,现在分式下方就是(SinX)^2-(CosX)^2这样你把分式上面的Sinx-Cosx拆开拆成sinX/
(-派/6,0)过程稍等再答:再问:第一步怎么来的再答:再答:还有疑问吗,若没有,别忘了采纳
∫(sinx)^5(cosx)^5dx=∫(sinx)^5(cosx)^4d(sinx)=∫(sinx)^5[1-(sinx)^2]^2d(sinx)=∫(sinx)^5d(sinx)-2∫(sinx
f(x)=sinx-√3cosx=2[(1/2)sinx-(√3/2)cosx]=2[sinxcos(π/3)-cosxsin(π/3)]=2sin(x-π/3)令-π/2+2kπ≤x-π/3≤π/2
f(x)=sinx—根号3cosx=2sin(x-60°)所以x在【-30°,0】上递增
求导f'(x)=2-sinx因为|sinx|0所以函数的单调增区间是负无穷到正无穷
f(x)=sin x-3cos x=2sin(x-π3),因x-π3∈[-43π,-π3],故x-π3∈[-12π,-π3],得x∈[-π6,0],故选D
y=sinx-cosx=√2·sin(x-π/4)∵函数y=sinx的单调区是[2kπ-π/2,2kπ+π/2]∴2kπ-π/2≤x-π/4≤2kπ+π/2即2kπ-π/4≤x≤2kπ+3π/4又x∈
∫(0,π/2)(sinx)^4*(cosx)^4dx=(1/16)*∫(0,π/2)(sin2x)^4dx=(1/32)*∫(0,π)(sinx)^4dx又∫(0,π)(sinx)^4dx=-cos
/>f(x)=sinx-√3cosx=2(sinx•1/2-cosx•√3/2)=2sin(x-π/3)由:-π/2+2kπ≤x-π/3≤π/2+2kπ得:-π/6+2kπ≤x
对于y=cosx来说单调递增区间是:(2kπ-π,2kπ),k为整数所以,求y=cos(π/3-2x)的单调递增区间只需π/3-2x∈(2kπ-π,2kπ),k为整数即,x∈(-kπ+π/6,-kπ+
值域为(1,2],当x=6分之π是取最大值为2,当x=-6分之π或2分之π时取最小值为1..注意:1是开区间,2是闭区间.楼主不厚道,居然不给悬赏分!让我重新复习这么久之前的东西,我容易吗,学过数学的
f(x)=2×(1/2sinx-√3/2cosx)=2×(cosπ/3sinx-sinπ/3cosx)=2sin(x-π/3)x∈【-π,0】x-π/3∈【-4π/3,-π/3】x-π/3∈【-π/2
y=1/2cos2x+根号3sinx*cosx=sin30cos2x+cos30sin2x=sin(2x+30)增区间为(0,30)(120,180)
y=x*sinx+cosxy'=sinx+x*sinx-cosx=x*cosxx属于(-π,-π/2),(0,π/2)时,y'>0,单调递增单调递增区间为(-π,-π/2),(0,π/2)
法1因为不定积分∫(x+sinx)/(1+cosx)dx=∫[x+2sin(x/2)cos(x/2)]/[2cos²(x/2)]dx=∫[x/(2cos²(x/2)
(0,π/4)U(3π/4,π)