" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
sin²x = 1 - cos²x
sec(x) - cos(x) = 1 / cos(x) - cos(x)
= 1 - cos²x / cosx
= sin²x / cosx
= sinx * sinx/cosx
= sinx tanx