" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
karena
sin²A + cos²A = 1
sin²A = 1 - cos²A
maka
cos 2A = cos²A - sin²A
cos 2A = 2cos²A - 1
diketahui
cos A= -24/25
maka
cos 2A = 2cos²A - 1
cos 2A = 2(-24/25)² - 1
cos 2A = 1024/625 - 1
cos 2A = 399/625