函数f(x)=1-2sin^2 (x+派/8)+2sin(x+派/8)cos(x+派/8)求详细化简
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/05/02 06:35:49
函数f(x)=1-2sin^2 (x+派/8)+2sin(x+派/8)cos(x+派/8)求详细化简
【cos2x=cos²x-sin²x
sin2x=2sinxcosx
sinx+cosx=√2sin(x+π/4) 】
f(x)=1-2sin^2 (x+派/8)+2sin(x+派/8)cos(x+派/8)
=sin²(x+π/8)+cos²(x+π/8)-2sin²(x+π/8)+2sin(x+π/8)cos(x+π/8)
=cos²(x+π/8)-sin²(x+π/8)+sin(2x+π/4)
=cos(2x+π/4)+sin(2x+π/4)
=√2sin(2x+π/4+π/4)
=√2sin(2x+π/2)
=√2sin[π/2-(-2x)]
=√2cos2x
sin2x=2sinxcosx
sinx+cosx=√2sin(x+π/4) 】
f(x)=1-2sin^2 (x+派/8)+2sin(x+派/8)cos(x+派/8)
=sin²(x+π/8)+cos²(x+π/8)-2sin²(x+π/8)+2sin(x+π/8)cos(x+π/8)
=cos²(x+π/8)-sin²(x+π/8)+sin(2x+π/4)
=cos(2x+π/4)+sin(2x+π/4)
=√2sin(2x+π/4+π/4)
=√2sin(2x+π/2)
=√2sin[π/2-(-2x)]
=√2cos2x
f(x)=sin(派-x)cos(2派-x)/sin(派/2+x)tan(派+a) 求f(31派/3)
函数f(x)=sin(2x+派/4)+cos(2x+派/4)
设函数f(x)=sin(派x/3-派/6)-2cos平方派x/6.(1)求f(x)的最小正周期及单调
已知函数F(X)=SIN(派-X)SIN(派/2-X)+COSX的平方,(1)求最小周期; (2)X属于[-派/8,3派
高一数学 已知函数f(x)=2sinxcos(派/2-x)-根号3*sin(派+x)cosx+sin(派/2+x)cos
已知sinx=3/5,求sin(x-3/2派cos(派-x)tan(派+x)
函数f(x)=sin(x+ 7派/4)+cos(x- 3派/4)求详细化简过程
已知函数f(x)=2sin(派x/8+派/4)+1
已知函数COS平方(X-派/6)-SIN平方X,求F(派/12)
已知函数f(x)=cos(2x-3/派)+2sin(x-4/派)sin(x+4/派)1.求f(x)的最小正周期和图像对称
cos(2x+派/2)=sin(2x)?
已知COS(X+派/4)=根号2/10,x属于(派/2,3派/4) 求sinx 求sin(2x+派\4)