cos22π/3等于多少啊?tan(- 7π/4) sin900° 都是多少
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cos22π/3等于多少啊?tan(-7π/4)sin900°都是多少cos22π/3等于多少啊?tan(-7π/4)sin900°都是多少cos22π/3等于多少啊?tan(-7π/4)sin900
cos22π/3等于多少啊?tan(- 7π/4) sin900° 都是多少
cos22π/3等于多少啊?
tan(- 7π/4) sin900° 都是多少
cos22π/3等于多少啊?tan(- 7π/4) sin900° 都是多少
cos22π/3=cos(7π+π/3)=-cos(π/3)=-1/2
原式= cos(8π-2π/3)
=cos(2π/3)
=-1/2
cos(22π/3)
=cos(21π/3+π/3)
=cos(7π+π/3)
=cos(π+π/3)
=-cos(π/3)
=-1/2
cos22π/3等于多少啊?tan(- 7π/4) sin900° 都是多少
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