This is probably a basic arithmetic problem but I have the following to validate
1/(sec + tan) = sec - tan
I simplify to
cos/(sin + 1) = (1-sin)/cos
clearing fractions gives some pythagorean statements which are true, but I bet there's some property about fractions that should tell me the above is true, ie
a/(b+1) = (1-b)/a
How does one verify/validate the identity?