" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
(cos A cos B - sin A sin B)/(cos A cos b) = 1 - tan A tan B
(cos A cos B/ cos A cos B - sin A sin B/cos A cos B )= 1 - tan A tan B
1 - tan A tan B = 1 - tan A tan B