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[tex] \frac{sin ( 360 - a)* tg (90+a) * ctg (270 -a) }{cos (360 +a)* tg (180 +a)} [/tex]
[tex] \frac{sin ( 360 - a)* tg (90+a) * ctg (270 -a) }{cos (360 +a)* tg (180 +a)} [/tex]
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-sina*(-ctga)*tga(/(cosa*tga)=tga/tga=1