若函数fx=asin(x π:4) 根号3sin(x-π:4)是偶函数
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fx=2asin²x-2√3asinxcosx+a+b=a(2-cos2x-√3sin2x)+b=a[2-2sin(2x+π/6)]+b2π/3
f(5π/12)=Asin(5π/12+π/4)=Asin(2π/3)=A*√3/2,(√为根号)=3/2A=√3f(θ)+f(-θ)=3/2√3sin(θ+π/4)+√3sin(-θ+π/4)=3/
解由题知A=3T=4(π/2-(-π/2))=4π又由T=2π/w故2π/w=4π故w=1/2故f(x)=3sin(1/2x+φ)其图像过点(-π/2,3)知3sin(1/2x(-π/2)+φ)=3即
因为对任意x属于R有f(x)≥f(5π/12)恒成立所以x=5π/12为图像最低点2*5π/12+φ=3pai/2+2kpai因为0<φ<2π所以φ=2pai/3fx=Asin(2x+2pai/3)f
f(x+pai/6)=Asin(2x+pai/3+a)=Acos(pai/6-a-2x)pai/6-a=2kpai,pai/6-a=2kpai+paif(x)=Asin(2x+pai/6-2kpai)
已知函数fx=asin(wx+f)的图像与x轴的交点,相邻两个交点之间的距离为π/2,且图像上,一个最高点为(π|6,2)当x属于(π|24,π|3),fx取值范围解析:∵函数fx=asin(wx+f
(1) 等式化简后:f(2)=±(√19/2)+3
0≤x≤π-π/4≤x-π/4≤3π/4sin(x-π/4)∈【-√2/2,1】ab=3最小值√2a*1+a+b=2------>a=-1/(√2+1)=1-√2a=1-√2,b=3
因为最小值是-2,所以A=2以为周期为2π/3所以由2π/w=2π/3,得ω=3所以y=2sin(3x+φ)又以为图像经过点(0,-√2)所以-√2=2sinφsinφ=--√2/2(-π/2再问:所
原式=1/2COSX+asin(x/2)cos(x/2)=1/2COSX+a/2sinx=1/2(cosx+asinx)因为最大值是2所以(√1+a^2)/2=2a=+-√15
f(x)=2asin(2x-π/3)+b0≤x≤π/2==>0≤2x≤π==>-π/3≤2x-π/3≤2π/3-√3/2≤sin(2x-π/3)≤1-√3a≤2asin(2x-π/3)≤2a-√3a+
A=2T=4*[π/6-(-π/6)]=4π/3w=2π/(4π/3)=1.5f(x)=2sin(1.5x+φ)2sin(1.5*π/6+φ)=2π/6+φ=π/2φ=π/3f(x)=2sin(1.5
(1)fx=Asin(wx+π/4)(其中x∈R,A>0,w>0)的最大值为2,最小正周期为8.那么A=2,2π/w=8∴w=π/4∴f(x)=2sin(π/4x+π/4)(2)两点P、Q的横坐标依次
已知函数fx=Asin(wx+φ),其中w>0.1)当A=w=2,φ=π/6时,函数g(x)=f(x)-m在[0,π/2]上有两个零点,求m的范围.2)当A=1,φ=π/6时,若函数fx图像的相邻两条
根据周期为π,可得w为2.由f(π/4)=Asin(2*π/4+ψ)+n=Asin(π/2+ψ)+n=Acosψ+n=√3+1,由fx的最大值为3可得A+n=3可得n=1,A=2,ψ=π/6所以,f(
f(2009)=Asin(πx+m)+Bcos(πx+k)=A(sinπcosm+cosπsin)+B(cosπcosk-sinπsink)=(-Asinm)+(-Bcosk)=-(Asinm+Bco
选项C正确!解析:由图可得:A=1,(3/4)*T=(11π/12)-(π/6)=3π/4,即:T=π,那么:w=2π/T=2则:f(x)=sin(2x+φ)又当x=π/6时,函数f(x)有最大值1即
1、∵函数fx=Asin(2x+5π/6)(A>0.x∈R)的最小值为-2∴A=2即f(x)=2sin(2x+5π/6)则f(0)=2sin(5π/6)=12、f(x)=2sin(2x+5π/6)=2
解f(x)=-x²+4x+a=-(x²-4x)+a=-(x²-4x+4)+4+a=-(x-2)²+4+a对称轴为x=2,开口向下∴在x∈[0.1]上,f(x)是