hitung tanpa menggunakan kalkulator:
a. (cos 60˚ - tan 45˚)(cos 30˚t + tan 45˚t)
b. cos 60˚ + sin30˚ per tan 30˚ + cot 60˚

1
a. (cos 60˚ - tan 45˚)(cos 30˚t + tan 45˚t)
a. (1/2 - 1) (1/2 √3 + 1)
=> 1/4 √3 + 1/2 - 1/2 √3 - 1
=> 1/2 (-1 -1/2 √3)

b. 1/2 + 1/2 : ( 1/3 √3 + 1/3 √3)
=> 1 : 1 = 1
eh salah yg b -_-
1 : 2/3√3
= 3/4 √2
ok..
trimz

Jawabanmu

2014-04-13T03:22:50+07:00
A.(1/2-1)t(1/2√3+1)=1/2+√3+2/2t b.1/2+1/2.√3+√3=1/2+3√3/2=1+3√3/2