Ответы на вопрос:
tg(5n/4+arccos(-3/4))=(tg(5n/4)+tg(arccos(-3//(1-tg(5/4)*tg(arccos(-3/=(1+tg(arccos(-3//(1-tg(arccos(-3/
tg(arccos(-3/4))=sin(arccos(-3/4))/cos(arccos(-3/4))=sqrt(1-cos^2(arccos(-3//(-3/4)=sqrt(1-9/16)/(-3/4)=(5/4)/(-3/4)=-5/3
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