Упростите выражение:
[tex]\frac{1}{1-tg^{2}\alpha} - \frac{1}{1-ctg^{2}\alpha}[/tex]
More Questions From This User See All
Упростите выражение:
[tex]\frac{1}{1-tg^{2}\alpha} - \frac{1}{1-ctg^{2}\alpha}[/tex]
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
1-tg^2a=cos2a/sin^2a
1-ctg^2a=-cos2a/cos^2a
sin^2a/cos2a+cos^2a/cos2a=1/cos2a
1-tg^2a=cos2a:sin^2a 1-ctg^2a=-cos2a:cos^2a sin^2a:cos2a+cos^2a:cos2a=1:cos2a