cos²a = 1-sin²a
cos²a = 1-144/169 = 25/169
т.к. четверть 3, то косинус отрицательный и равен -5/13
ctga = cosa/sina = -5/13 * (-13/12) = 5/12
tga = 12/5 = 2.4
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
cos²a = 1-sin²a
cos²a = 1-144/169 = 25/169
т.к. четверть 3, то косинус отрицательный и равен -5/13
ctga = cosa/sina = -5/13 * (-13/12) = 5/12
tga = 12/5 = 2.4