求值cos2π/5*tan5π

求值cos2π/5*tan5π 数值：sin9π/4+cos2π/3+tan5π/4 数值：sin9π/4+cos2π/3+tan5π/4 求值：sin9派/4+cos2派/3+tan5派/4 sin9π/4+cos2π/3+tan5π/4的值. 求值：sin9派/4+cos2派/3+tan5派/4在线等 求值：一、（1+cos20°）/2sin20°-sin10°(cot5°-tan5 °）已知tan（α+ π/4）=-3,求tan2α,cos2α,sin2α 注：π/4=45°啊第二题 已知tan（α+ π/4）=-3，求tan2α，cos2α，sin2α 求值cosπ/5cos2π/5cos4π/5cos8π/5 求值：cos2π/7 * cos4π/7 * cos6π/7 求值cos2π/9*cos4π/9*8π/9 求值:cosπ/7*cos2π/7*cos3π/7 求值:cos2π/7cos4π/7cos8π/7 求值cos2π/9cos4π/9cos8π/9 tan5分之π+tan5分之2π+tan5分之3π+tan5分之4π怎么算 化简(tan5π/4+tan5π/12)/(1-tan5π/12) 化简(tan5π/4+tan5π/12)/(1-tan5π/12) 注意分母啊 细心! 比较大小:tanπ/5,√3,tan5π/12 计算 tanπ/12-tan5π/12