化简sin(派/4-x)sin(派/4+x)
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/16 09:44:17
化简sin(派/4-x)sin(派/4+x)
sin(派/4-x)sin(派/4+x)
=(sinπ/4cosx-cosπ/4sinx)*(sinπ/4cosx+cosπ/4sinx)
=(sinπ/4cosx)^2-(cosπ/4sinx)^2
=(cosx)^2/2-(sinx)^2/2
=(cos2x)/2
=(sinπ/4cosx-cosπ/4sinx)*(sinπ/4cosx+cosπ/4sinx)
=(sinπ/4cosx)^2-(cosπ/4sinx)^2
=(cosx)^2/2-(sinx)^2/2
=(cos2x)/2
函数f(x)=sin(2x+派/4)+cos(2x+派/4)
cos(x-三分之派)=3/4,则sin(六分之派+x)
已知sinx=4/5,x属于(派/2.派)求sin(2x+派/4)的值
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)
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
f(x)=sin(派-x)cos(2派-x)/sin(派/2+x)tan(派+a) 求f(31派/3)
已知sinx=-5/13,x属于(派,3派/2),求sin(x-派/4)
化简sin(13派/6)+cos(7派/3)-tan(49派/4)
sin平方(派/3 -x)+sin平方(派/6+x)=
f(x)=2sin(2x-派/4)在【0派】的减区间
化简:sin(2派-x)tan(派+x)cot(-x-派)/tan(3派-x)cos(派-x)
化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8)