SIN(-7/6π）,cos（15/4π）,tan(-8/3π）,tan(33/4π)是负六分之七,四分之十五,负三分之八,四分_数学解答

SIN(-7/6π）,cos（15/4π）,tan(-8/3π）,tan(33/4π)
是负六分之七,四分之十五,负三分之八,四分之三十三啊

人气：383 ℃　时间：2020-09-14 22:52:32

解答

sin(-7/6π）
=sin(2π-7π/6)
=sin5π/6
=1/2
cos（15/4π）
=cos(4π-π/4)
=sin(-π/4)
=cos(v/4)
=√2/2
tan(-8/3π）
=tan(-3π+π/3)
=tan(π/3)
=√3
tan(33/4π)
=tan(8π+π/4)
=tan(π/4)
=1