作业帮sin(a+105)cos(a-15)-cos(a+105)sin(a-15)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/09 03:09:19
sin(a+105)cos(a-15)-cos(a+105)sin(a-15)
sin(a+105)cos(a-15)-cos(a+105)sin(a-15)
sin(a+105)cos(a-15)-cos(a+105)sin(a-15)
sin(a+105)cos(a-15)-cos(a+105)sin(a-15)
=sin(a+105-a+15)
=sin(120)
=sin60
=根号3/2
sin(a+105度)cos(a-15度)-cos(a+105度)sin(a-15度)
sin(a+105)cos(a-15)-cos(a+105)sin(a-15)
sin(a+45°)sin(a+15°)+cos(a+45°)cos(a+15°)
(cos a+sin a)/(cos a-sin a) 怎么算~
化简sin a+cos a
sin a *cos a 最小值
若sin a cos a
求sin a +cos a
化简tan a(cos a-sin a)+sin a(sin a+tan a)/1+cos a
sin/cos^2a+cos/sin^2a最小值
求证1+sin a+cos a+2sin acos a/1+sin a+cos a=sin a+cos a
已知cos(75°+a)=1/3,则sin(a-15°)+cos(105°-a)的值
化简(sin a^2/cos a +cos a)*cot a
cos(150°-a)+sin(a-105°)=?
求证:sin 2a/1+sin a+cos a=sin a+cos a-1急
cos（75+a）=sin（15-a）为什么
化简~cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)15为15度
化简sin(a-15度)cos（a+15度）+cos（a-15度)sin(a+15度)