cos 260*sin260*sin 130*cos 160 ПОМОГИТЕ КТО НИТЬ Я ХЗ КАК ЭТО РЕШАТЬ(
cos(260)*sin(260)=sin(520)/2=sin(160)/2;
sin(160)*cos(160)/2=sin(320)/4=-sin(40)/4;
sin130=sin50=cos40;
-sin40/4*cos40=-sin(80)/8
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cos(260)*sin(260)=sin(520)/2=sin(160)/2;
sin(160)*cos(160)/2=sin(320)/4=-sin(40)/4;
sin130=sin50=cos40;
-sin40/4*cos40=-sin(80)/8