sin^3(-a)cos(2pi+a)tan(-a-pi)化简
问题描述:
sin^3(-a)cos(2pi+a)tan(-a-pi)化简
答
sin^3(-a)cos(2π+a)tan(-a-π)
=-sin^3acosa(-tan(π+a)
=sin^3acosatana
=sin^3acosasina/cosa
=sin^4a