sin(5πt)可不可以化简成sin(πt),sin(5πn)可不可以化简成sin(πn),为什么?请补充说明一下sin(5πt)及sin(5πn)的频率和周期,离散连续求周期频率这块已经彻底迷茫了,

sin(5πt)可不可以化简成sin(πt),sin(5πn)可不可以化简成sin(πn),为什么?请补充说明一下sin(5πt)及sin(5πn)的频率和周期,离散连续求周期频率这块已经彻底迷茫了, 计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8) 化简sin(4π-a)*sin(5π-a)=? sin(-5π/3)等于 sin(5π/12)= sin(-5π/12)是多少 sin(π/5)怎么算? sin(π/18)sin(5π/18)sin(-65π/18)= 求sin(π/14)*sin(3π/14)*sin(5π/14)的值 求sin^2π/5+sin^23π/5的值sin方 Sin（5π+α)=sin(π+α)=-sinα正确吗? sin (ωt) / cos (ωt) = sin (ωt) / sin(ωt + π/2) = e ^ (-j.π/2) = -j 对么?sin (ωt) / cos (ωt) = sin (ωt) / sin(ωt + π/2) = e -j.π/2 = cos(-π/2) + j.sin (-π/2) = -j ,tan (ωt) = -j 那么 tan (ωt) = -j 但是sin (ωt) = (e j.ωt - e -j. sin(α+2/5π)化简成sin(2/π+α)为什么 sin(2π+a) ,sin(π+a),sin(5π+a) 的区别为什么sin(2π+a) =sina sin(π+a)=-sina sin(π-t)=sint吗?请详细说明. 函数f(x)=sin(2x+t) (-π 设函数f(x)=sin(wx+t)(-π/2 设函数f(x)=sin(wx+t)(-π/2