求/sin(-315°)/+cos(1320°)+tan23π/4

问题描述:

求/sin(-315°)/+cos(1320°)+tan23π/4

原式=|sin(45-360)|+cos(1440-120)+tan(6π-π/4)
=|sin45|+cos120+tan(-π/4)
=√2/2+(-1/2)+(-1)
=(√2-3)/2