已知函数fx =sin2x-√3cos2x
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/11 01:20:18
派,负四分之派到四分之派,再问:可我不知道怎么写过程。
f(x)=(1+cos2x+sin2x)/sin(x+π/2)=(1+cos2x+sin2x)/cosx(1)定义域,cosx≠0定义域x≠kπ+π/2,k∈Z(2)f(x)=(1+cos2x+sin
(1)|sinx|+|cosx|=√[1+2|sinxcosx|]=√[1+|sin2x|]记a=sin2x则f(x)=√(1+|a|)-a-1当a=0时,记t=√(1+a),f(x)=t-t^
函数fx=2sin²x+sin2x-1=sin2x-cos2x=√2sin(2x-π/4)最大值=√2再问:�����ֵʱx��ȡֵ��ô��
求导数,导数为零时取最值再问:������д�¹��ô��лл��再答:再答:����������һ�ַ���
f(x)=2根号3sinxcosx+cos²x-sin²xf(x)=根号2(2sinxcosx)+(cos²x-sin²x)f(x)=根号3sin2x+cos2
再问:得数再答:最后的不是得数?你这是有多差呀再问:?。。。再问:给我吧再问:采纳了,再问:我懂了谢谢,采纳了
(1)f(x)=sinx(cosx-√3sinx)=sinxcosx-√3sin²x=1/2sin2x-√3/2(1-cos2x)=1/2sin2x+√3/2cos2x-√3/2=sin(2
(1)∵y=sin2x+sin2x+3cos2x=sin2x+cos2x+2=2sin(2x+π4)+2,∴当2x+π4=2kπ-π2(k∈Z),即x=kπ-3π8(k∈Z)时,f(x)取得最小值2-
f(x)=[1-cos(2x)]/2+sin(2x)+3[1+cos(2x)]/2=sin(2x)+cos(2x)+2=√2sin(2x+π/4)+2.周期T=kπ,k∈Z且k≠0.最小正周期为π.
f(x)=√3sin2x+cos2x=2(cosπ/6sin2x+sinπ/6cos2x)=2sin(2x+π/6)单调递增区间为:2kπ-π/2≤2x+π/6≤2kπ+π/2解得:kπ-π/3≤x≤
fx=1/2sin2x-根号3/2cos2x+1=sin2xcosπ/3-cos2xsinπ/3+1=sin(2x-π/3)+1最小正周期=2π÷2=π增区间:2kπ-π/2≤2x-π/3≤2kπ+π
(1)f(x)=cos²x=(1/2)+(1/2)cos2x,对称轴2x0=kπ,sin2x0=0;所以g(2x0)=1+(1/2)sin2x0=1;(2)h(x)=f(x)+g(x)=(1
f(x)=2sinx/2cosx/2√3cosx=sin(x/2x/2)√3cosx=sinx√3cosx=√(1^2√3^2)sin(xπ/3)=2sin(xπ/3)函数f(x)的最小正周期T=2π
f(x)=2(cos45*sin2x+sin45*cos2x)=2sin(2x+π/4)f(3π/8)=2sinπ=0f(a/2-π/8)=2sina=√3/2sin2a=2sinacosaa是第二象
(1)∵cos2x=2cos^2x-1∴f(x)=1/2+cos(2x+π/6)/2对称轴2x0+π/6=π+2kπx0=5π/12+kπg(x0)=1+1/2sin(5π/6+2kπ)=5/4(2)
f(x)=√3sin2x-2sin²x=√3sin2x-(1-cos2x)=2sin(2x+π/6)-1∴当sin(2x+π/6)=1时f(x)max=2*1-1=1