" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
sin² x + cos² x = 1
atau masukan 60 derajatnya
sin² 60 + cos² 60 = 1
(√3/2)² + (1/2)² = 1
3/4 + 1/4 = 1
4/4 = 1
1 = 1 (terbukti)
b. cos² 30 - sin ² 30 = cos 60
cos² x - sin²x = cos 2x
atau masukan angka
cos² 30 - sin² 30 = cos 60
(√3/2)² - (1/2)² = 1/2
3/4 - 1/4 = 1/2
2/4 = 1/2
1/2 = 1/2 (terbukti)
c. sec² 60 -cot² 30 = 1
1/ cos² 60 - cos²30/sin²30 = 1
1/ (1/2)² - (√3/2)² / (1/2)² = 1
1 / (1/4) - (3/4) / (1/4) = 1
(1/4) / (1/4) = 1
1 = 1 (terbukti)
d. cosec² 30 - cot²30 = 1
1/sin² 30 - cos²30/ sin²30 = 1
(1 - cos²30) / sin² 30 = 1
sin² 30 / sin² 30 = 1
1 = 1 (terbukti)
e. sin (60 + 30) = sin 60 cos 30 + cos 60 sin 30
sin 90 = (√3/2) (√3/2) + (1/2) (1/2)
1 = 3/4 + 1/4
1 = 4/4
1 = 1 (terbukti)