" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Kelas 11 MatematikaBab Trigonometri Lanjut
sin² a + cos² a = 1
cos² a = 1 - sin² a
******************************************
sin² a - cos² a = sin² a - (1 - sin² a)
sin² a - cos² a = sin² a - 1 + sin² a
sin² a - cos² a = 2 sin² a - 1
terbukti