posted by abdo on .
I need to prove that the following is true. Thanks
(cosx / 1-sinx ) = ( 1+sinx / cosx )
I recall this question causing all kinds of problems when I was still teaching.
it requires a little "trick"
=cosx/(1-sinx) multiply top and bottom by 1+sinx, (creating the difference of square pattern)
=cosx(1+sinx)/cos^2x divide by cosx