求函数y=sin2x 根号3cosx最大值和周期
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y=sin²x+√3/2sin2x+2cos²x=√3/2sin2x+cos²x+1=√3/2sin2x+1/2(2cos²x-1)+3/2=√3/2sin2x
y=√2×sin2x×cos2x化简得y=√2/2*sin4x所以函数的振幅为√2/2周期为π/2当x∈(kπ/2-π/8,kπ/2+π/8)时为增函数当x∈(kπ/2+π/8,kπ/2+3π/8)时
y=e^sin2x复合函数求导:y′=e^sin2x*cos2x*2=2cos2x*e^sin2x
y'=2cos2x
由倍角公式:cos2x=2cos²x-1,得:cos²x=(1+cos2x)/2所以,y=(√3/2)(1+cos2x)+(1/2)sin2x=(1/2)sin2x+(√3/2)c
f(x)=sin2x-√3cos2x=2(1/2*sin2x-√3/2cos2x)=2(sin2xcosπ/3-cos2xsinπ/3)=2sin(2x-π/3)最小正周期T=2π/2=π因为-1
化简得:y=sin(2x+π/3)+根号3/2周期是π,增区间是(kπ-5π/12,kπ+π/12)(k属于z)
y=√3cos²x+1/2sin2x=√3/2(cos2x+1)+1/2sin2x=√3/2cos2x+1/2sin2x+√3/2=sin(π/3)cos2x+cos(π/3)sin2x+√
y=sin2x-根号3·cos2x=2(sin2xcosπ/3-cos2xsinπ/3)=2sin(2x-π/3)当2x-π/3∈【2kπ,2kπ+π),即x∈【kπ+π/6,kπ+2π/3),其中k
y=根号3乘cos平方x+1/2sin2x=根号3乘以二分之(1+cos2x)+二分之sin2x=sin(三分之π+2x)+二分之根号三当三分之π+2x=二分之π+2kπ,求出x,此时y最大=1+二分
y=cos2x-(√3)sin2x=-2[(√3/2)sin2x-(1/2)cos2x]=-2sin[2x-(π/6)].即y=-2sin[2x-(π/6)].∴该函数的最大值为2.
由y=sin2x+sin2x+3cos2x=1+sin2x+2cos2x=1+sin2x+(1+cos2x)=2sin(2x+π4)+2(1)当sin(2x+π4)=−1时,y最小=2-2,此时,由2
sin2x>=02kpai
(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-
2sin2x+√3>0,且9-x^2>=0.得sin2x>-√3/2,且|x|
原式=2(﹙根号3/2﹚sinx-﹙1/2﹚cosx﹚+1=2[sinxcosπ/6-cosxsinπ/6]+1=2six﹙2x-π/6﹚+1
解y=√3cos2x+sin2x+1=2(√3/2cos2x+1/2sin2x)+1=2(sin2xcosπ/3+cos2xsinπ/3)+1=2sin(2x+π/3)+1∵sin(2x+π/3)∈[
y=√3sin2x+cos2x=2(sin2xcosπ/6+cos2xsinπ/6)=2sin(2x+π/6)所以,y=2sin(2x+π/6)的最大值是2.