Ответ:
1) cos A<0 (90°<A<180°)
2) 1/(1+25/144)=1/(169/144)=144/169
cosA=-12/13
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Ответ:
1) cos A<0 (90°<A<180°)
2) 1/(1+25/144)=1/(169/144)=144/169
cosA=-12/13