数值：sin9π/4+cos2π/3+tan5π/4
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数值：sin9π/4+cos2π/3+tan5π/4数值：sin9π/4+cos2π/3+tan5π/4数值：sin9π/4+cos2π/3+tan5π/4sin9π/4+cos2π/3+tan5π/
数值：sin9π/4+cos2π/3+tan5π/4
数值：sin9π/4+cos2π/3+tan5π/4
数值：sin9π/4+cos2π/3+tan5π/4
sin9π/4+cos2π/3+tan5π/4
=sinπ/4-cosπ/3+tanπ/4
(2)^1/2
=______ -3/2
2
数值：sin9π/4+cos2π/3+tan5π/4
数值：sin9π/4+cos2π/3+tan5π/4
sin9π/4+cos2π/3+tan5π/4的值.
求值：sin9派/4+cos2派/3+tan5派/4
sin9π/4 * tan7π/3 =_____________
求值：sin9派/4+cos2派/3+tan5派/4在线等
求值cos9π/4+tan(-11π/6)-sin9π/4+tan(--11π/3)
x(t)=cos2πt+sin10t ,是不是周期函数
化简cos2(α-π/4)+cos2(α+π/4)
cos2π/3等于多少
cos2/3π等于几?
如何计算cos2π/3,
化简cos2θ+cos2(θ+2π/3)cos2(θ-2π/3)
已知角a终边上一点P(-4,3),cos（4π+a）sin（a）/cos（-π）（sin9π/2）的值?
已知cos(α－π／6）＋sinα＝4／5∫3,求sin9α＋7π／6)的值.写出具体步骤.谢啦 .
化简cos2α/tan(π/4+α)
cos2α/tan(α+π/4)=
cos2π等于多少?