tan(-7π/12)求解,

tan(-7π/12)求解, tan(π/12)-(1/tan(π/12)) 求解为什么会转成tan, tan(-7π/12)的值是 比较大小 tan（-1320°） 和tan 7π/12 已知tan(a+4/π)=2 则1+3sina*cosa求解, 设tan(π+a)=1/3,求sina+cosa/sina-cosa求解 急!∫tan²xdx求解 arctan(tan a)等于a么,求解? (1-tan^2π/12)/(tanπ/12)化简 计算 tanπ/12+1/tanπ/12 计算tanπ/12 / (1-tan^2π/12)= tan(π/12)+1/tan(π/12)=啥? tanπ/12-1/tanπ/12= 化简：tan(π/8)+1/tan(π/12) tan(π/8)+1/(tan(π/12))值,要过程 化简tan(7π+α) tan(-π/9),tan(-π/7)的大小 tan(9π/8),tan(π/6)的大小