sin5∏/3=?

sin5∏/3=? sin5/3π= ,cos5/3π sin5π/3=sin(2π-π/3) sin5/3π+tan3/4π*cos8/3π=?求详解 sin5π/8=cosπ/8? sin5π/6=1/2? (cot20°-√3)(cos5°+sin5°)(cos5°-sin5°) (cot30°-√3)(cos5°+sin5°)(cos5°-sin5°)求值 求值(cot20°-根号3)(cos5°+sin5°)(cos5°-sin5°),要详程 (cot20°-√3)(cos5°+sin5°)(cos5°-sin5°)计算 sin2/3π=? sin5/6π=? sin7/6π=? sin(-π/3）=? 判断三角函数奇偶性fx=sin5/6x gx=f(x+π/3) 判断gx的奇偶性 sin 23派/3如何化简到sin5派/3 sin5π /3为什么等于—√3/2? cos5/6π=?sin5/6π=? （2cos55-（√3）sin5）/cos5 cos5π/12-根3sin5π/12过程 sin1+sin2+sin3+sin4+sin5=?得多少