I'm reading on a distance, and this is the first time I just got totally stuck. I need help really fast!
It's probably really easy.
I understand that sin^2v + cos^2v = 1
Now for an example:
What is Sin(v) if cos(v) = -(24/25)?
I'm doing sin^2(v) = 1-(-(24/25)^2) = 1.9216 which ofcourse is wrong (answer is -(7/25)).
1/cos^2(v) = 1 + tan^2(v)
This is how the solution is written in the book:
1+tan^2(v) = 1 + (sin^2(v)/cos^2(v)) = (cos^2(v) + sin^2(v))/cos^2(v)
For some reason I don't get how 1 becomes cos^2(v).
What am I doing wrong? Appreciate help!!