cos780°=cos(720°+60°)=cos60°=0,5;
sin(13π/6)=sin(2π+π/6)=sin(π/6)=sin30°=0,5
это
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cos780°=cos(720°+60°)=cos60°=0,5;
sin(13π/6)=sin(2π+π/6)=sin(π/6)=sin30°=0,5
это