搜搜考试网化简~cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)
来源：学生作业帮 编辑：搜搜考试网作业帮 分类：数学作业 时间：2024/06/16 01:39:41
化简~cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)
15为15度
15为15度
cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)
=cos^2(a+15)+sin^2(a+15)-sin^2(a+15)+sin^2(a-15)+sinacosa
=1+[sin^2(a-15)-sin^2(a+15)]+sinacosa
=1+[sin(a-15)+sin(a+15)][sin(a-15)-sin(a+15)]+sinacosa
=1+[2sinacos15]*[2cosa*sin(-15)]+sinacosa
=1-sin2a*sin30+(1/2)*sin2a
=1-(1/2)*sin2a+(1/2)*sin2a
=1
=cos^2(a+15)+sin^2(a+15)-sin^2(a+15)+sin^2(a-15)+sinacosa
=1+[sin^2(a-15)-sin^2(a+15)]+sinacosa
=1+[sin(a-15)+sin(a+15)][sin(a-15)-sin(a+15)]+sinacosa
=1+[2sinacos15]*[2cosa*sin(-15)]+sinacosa
=1-sin2a*sin30+(1/2)*sin2a
=1-(1/2)*sin2a+(1/2)*sin2a
=1
化简cos^2(a+15)+sin^2(a-15))+sin(a+180)cos(a-180)
化简~cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)
化简：[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-180度)]
4.9-1/化简：[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-
化简:sin(a+180)cos(-a)sin(-a-180)
化简Sin A + Sin 2A / 1+cos A +
化简:sin(-a)cos(2π+a)sin(-a-π)
化简sin^2a-cos^2a
化简sin a+cos a
sin^2a+sin^2a.cos^2a+cos^2a化简
化简[cos(a-π)/sin(π-a)]sin(a-π/2)cos(π/2+a)=
化简sin(π+a)cos(-a)+sin(2π-a)cos(π-a)