6sin(-90)+3sin0-8sin270+12cos180
=6*sin(-90)+3*0-8*sin(270-360)+12*(-1)
=6*sin(-90)-8*sin(-90)-12
=-2*sin(-90)-12
=-2*(-1)-12
=-10
6sin(-90)+3sin0-8sin270+12cos180
=6*sin(-90)+3*0-8*sin(270-360)+12*(-1)
=6*sin(-90)-8*sin(-90)-12
=-2*sin(-90)-12
=-2*(-1)-12
=-10