sin296π+cos(−293π)+tan(−25π4)
sin296π+cos(−293π)+tan(−25π4)
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
已知tanα=3,求2cos(π−α)−3sin(π+α)4cos(−α)+sin(2π−α)
tan(a-4π)cos(π+a)sin^2(a+3π)/tan(3π+a)cos^2(2/5π+2)=0.5,求tan
cosπ/3-tanπ/4+cosπ-sin3π/2 化简计算
sin(4π/3)*cos(25π/6)*tan(-3π/4)
sin(-4π/3)cos(-23π/6)tan(25π/4)=?
sin29/6π+COS(-29/3π)+tan(-25/4π)答案拜托了各位
sin14/3π+cos(-23π/4)+tan(-25π/3)=?
化简(2cos^2A-1)/2tan(π/4-A)cos^2(π/4-A)
1)求证cotαcosα/cotα-cosα=tan(α/2+π/4)
已知tan(θ+π/4)=-2,求cosθ平方+sinθcosθ-1