夹着角的直角边比斜边是cosa 夹着角的直角边比角对着的直角边是tga 角对着的直角边比夹着角的直角边是ctga sin37.5°=0.60876145320768 cos37.5°=0.79335332172272 tg37.5°=0.76732703644046 ctg37.5°=1.3032252905351 sin30°=1/2 cos30°=0.577 tg30°=0.1923 ctg30°=1.732 ...