Call 1800-123-2003
User login
Call 1800-123-2003
Our Schools
SabariGiri Residential School
"Smartindia is the best online tool for school students." Ms Deepa Chandran, Principal Anchal
M. G. M. Model School
"Smartindia is one of the best supplementary education tool for school students." Ms Pooja, Principal
Read More
Demo Video
Take a Demo Exam
Ask a Teacher
If secA + tanA = 7, then find secA - tanA. |
| (secA + tanA)(secA - tanA) = sec2A -tan2A. We know that sec2A -tan2A = 1 ie , (secA + tanA)(secA - tanA) = 1 implies secA - tanA = 1/7 (since secA + tanA = 7) |
