化简:sina(π-3)+cos(π/2+3)=
问题描述:
化简:sina(π-3)+cos(π/2+3)=
答
sin(π-3)+cos(π/2+3)
=sin3-sin3
=0
化简:sina(π-3)+cos(π/2+3)=
sin(π-3)+cos(π/2+3)
=sin3-sin3
=0