1/cos^2а - 1=tg^2a+1-1=tg^2a, т.к. 1/cos^2a=tg^2a+1
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
1/cos^2а - 1=tg^2a+1-1=tg^2a, т.к. 1/cos^2a=tg^2a+1