" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
________________
cos60° cos15° cos25°
sin45° sin(90-25) sin(90-15)
____________________
cos60° cos15° cos25°
1/2 akar2 cos25° cos15°
__________________
1/2 cos15° cos25°
1/2akar2
______
1/2
=akar2