cos(-x)=cosx
-44√2(cos(-315°))=-44√2(cos315°)=-44√2cos45°=
=-44√2(√2/2)=-22√2√2=-22×2=-44
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cos(-x)=cosx
-44√2(cos(-315°))=-44√2(cos315°)=-44√2cos45°=
=-44√2(√2/2)=-22√2√2=-22×2=-44