作业帮求值：log2cos(pai/9)+log2cos(2pai/9)+log2cos(4pai/9)pai代表圆周率
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 11:55:50
求值：log2cos(pai/9)+log2cos(2pai/9)+log2cos(4pai/9)pai代表圆周率
求值：log2cos(pai/9)+log2cos(2pai/9)+log2cos(4pai/9)
pai代表圆周率
求值：log2cos(pai/9)+log2cos(2pai/9)+log2cos(4pai/9)pai代表圆周率
log2 cos(π/9)+log2cos(2π/9)+log2cos(4π/9)
=log2 [cos(π/9)*cos(2π/9)*cos(4π/9)]
=log2 sin(π/9)*[cos(π/9)cos(2π/9)cos(4π/9)]/sin(π/9)
=log2 1/2*[sin(2π/9)cos(2π/9)cos(4π/9)]/sin(π/9)
=log2 1/8cos(8π/9)/sin(π/9)
=log2 1/8
=log2 （1/2）^3
=log2 2^-3
=-3
求值：log2cos(pai/9)+log2cos(2pai/9)+log2cos(4pai/9)pai代表圆周率
求值：log2cosπ/9+log
求值：log2cosπ/9+log2cos2π/9+log2cos4π/9
求值：log2cos派/9+log2cos2派/9+log2cos4派/9
求值：log2cosπ/9+log2cos2π/9+log2cos4π/9.
求y=log2cos(3分之x+4分之pai)单调增区间
求值 tan(-23pai/6)
求值log2sin(π/8)+log2cos(π/8)2是以2为底
求值Cos pai/17 *cos 2pai/17*cos 4pai/17*cos 8pai/17
求值:cos(2pai/7)+cos(4pai/7)+cos(6pai/7)pai打不出,不好意思
sin^4pai/8+cos^4pai/8求值
cos(-pai-a) 化简求值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
sin (pai/14)sin(3pai/14)sin(5pai/14)求值
Lo
求值cos(2arctan根号6+pai/3)
求值sin[arccos(-3/5)+pai/6]如题,