August 2022 1 17 Report
в какой четверти находится угол а если :
а) sin a >0 и tg a<0;
б) cosec a<0 и cos a <0;
в) ctg a>0 и sec a<0;
г) sin a >0 и ctg a>0;
д) cos a<0 и sec a <0;
е) tg a>0 и cos a <0?
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