Question
Establish the following identity
sin 2x/sinx - cos2x/cosx = secx
sin 2x/sinx - cos2x/cosx = secx
Answers
Reiny
Use sin 2x = 2sinxcosx and
cos 2x = 2cos^2x - 1
in the left side, it comes apart nicely
cos 2x = 2cos^2x - 1
in the left side, it comes apart nicely