若函数fx=asin(x π:4) 根号3sin(x-π:4)是偶函数

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