Page 162 - Math Grade 11 (Advance)

PROEUS DARA

5Jt .. 5Jt)
r;:;(
z = - Zt = ,..;2 cos- + 1 sm- '1
z 12 12
2
0 • 0
ruunn?l~ 1
u
l+i/3 1+iJ3
= -
z = 2i( cos60° + isin60o) = ·( 1 ./3) i
2z - + r-
2 2
· · Jt sh 1 =cos Jt + zsm Jt
r~ · = cos rc + tsm 2 · · 2 '1
r
2 2
z = cos 2Jt + i sin 2Jt

3Jt . . 3Jt
= cos-+ tsm-
2 2
o.!"'C"o 3Jt .. 3Jt '1
~u ~o z = cos + tsm
2 2

2 2
Zt = -l+iJ3=>r = J(-1) +(J3) = 2
cos<p = ~ = - ! sb sin<p = ~ = J3
r 2 r 2

.. Jt) '1
t "",..,..," 1 . r::;3 2( cos 2 Jt +zsm 2
>~1..1•~ z =- +r,..;.J =
1 3 3
z = 1 + i => r = Jf+l = 12
2
cos<p = ~ = ..!.. = 12 sh sin<p = !? = ..!.. = 12
r 12 2 r 12 2

t!:lQ'lS z 2 = 1 + i = 12( cos~+ isin~)

2Jt .. 2~
3
Zt 2( cos 3 + zsm )
=>-=------
z2
12( cos~+ isin~)

r;:;2( 5Jt . . 5Jt)
= ,..;L. cos +zsm
12 12
r;:;2 5Jt . r;:;2 • 5Jt (1)
11 = ,..JL.COS 12 + l,..JL.Slfl 12

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