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

问题描述:

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

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