BLOG INI BERISI MODUL - MODUL MATEMATIKA SMA BESERTA DENGAN TUGAS YANG BISA DISELESAIKAN SECARA MANDIRI
Minggu, 22 Agustus 2010
TUGAS KELAS XII IPS DEADLINE 24 AGUSTUS 2010
Bagi siswa kelas XII IPS silahkan kerjakan tugas ini di buku tugas dan silahkan dikumpulkan tanggal 24 Agustus 2010. Klik di sini
Rabu, 18 Agustus 2010
cos 10 + cos 110 + cos 130
do you know what is the value of cos 10 + cos 110 + cos 130?
according to mathematical calculations if it is equal to zero, how can you?explanation like this:The first time you have to remember that the sum of the commutative law applies, so nothing wrong if we do first is to calculate the value of cos 110 + cos 130 first.
(Remember that: cos (A + B) + cos (A - B) = 2.cos A.cos B)
The value of cos 110 + cos 130 = 2.cos 120.cos10
= 2. (-0.5). Cos 10
= - Cos 10
from about cos 10 + cos 110 + cos 130 = cos 10 - cos 10
= 0
became evident that the cos 10 + cos 110 + cos 130 = 0
thanks please write your comment
according to mathematical calculations if it is equal to zero, how can you?explanation like this:The first time you have to remember that the sum of the commutative law applies, so nothing wrong if we do first is to calculate the value of cos 110 + cos 130 first.
(Remember that: cos (A + B) + cos (A - B) = 2.cos A.cos B)
The value of cos 110 + cos 130 = 2.cos 120.cos10
= 2. (-0.5). Cos 10
= - Cos 10
from about cos 10 + cos 110 + cos 130 = cos 10 - cos 10
= 0
became evident that the cos 10 + cos 110 + cos 130 = 0
thanks please write your comment
Langganan:
Postingan (Atom)