Вычислить:
1)1+tg^2 (-П/6)/1+ctg^2 (-П/6)
2)3-sin^2 (- П/3)-cos^2 (-П/3)/2cos (-П/4)
Упростить выражение:
2)cos a - ctg a sin (-a)
4)tg (-a)ctg (-a)+cos^2 (-a)+sin^2 a
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