Ответ:
cos270-a+sin180-a+tg270+a+ctg-a
-sin(a)+sin(a)-ctg(a)-ctg(a)
-2ctg(a)
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Ответ:
cos270-a+sin180-a+tg270+a+ctg-a
-sin(a)+sin(a)-ctg(a)-ctg(a)
-2ctg(a)