化简：cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度)

化简：cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度) 化简sin(a-15度)cos（a+15度）+cos（a-15度)sin(a+15度) 化简~cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)15为15度 4.9-1/化简：[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-180度)].做出来都是1+sin(2a) sin 45度cos 15 度－cos 45度sin 15度等于多少? sin 45度cos 15 度—cos 45度sin 15度等于多少 sin(a+105度)cos(a-15度)-cos(a+105度)sin(a-15度) sin(-75度)sin(-435)cos(-15)tan(-15)cot(-15)tan(-105)cos(-105)cos(-105) sin(-75度)sin(-435)cos(-15)tan(-15)cot(-15)tan(-105)cos(-105)cos(-105) 化简：[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-180度)].请大家解释一下.[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-180度)]=[cos(2a+30)+1]/2+[1-cos（2a-30)]/2+1/2sin2a=1+[cos(2a+30)-cos(2a-30)]/2+1/2sin2a=1-2si cos x/sin x+sin x/(1+cos x) 化简. 化简sin a+cos a sin^2cos^2化简 sinα+cosα 化简 化简：1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ 化简 sin(θ+75°)+cos(θ+45°)+cos(θ+15°)化简题sin(θ+75°)+cos(θ+45°)+cos(θ+15°) 化简：cos的二次方(-@)- tan(360度+@)/sin(-@) cos平方15度—sin平方15度