化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))_数学解答

化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))

人气：418 ℃　时间：2020-03-26 22:54:02

解答

(sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π))
=（sin^2(a）cosa*cosa/sina）/(-sina/cosa*cos^3（a))
=（sina*cos^2(a））/(-sina*cos^2（a))
=-1