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tan x = 1 .. pers 2
pers 2 :
Sin x = cos x
pers 1 : Sin x + cos x = 3
Sin x + sin x = 3
2 sin x = 3
Sin x = 3/2
Cos x = 3/2
10. tg α = ..pers 1
tg γ = ..pers 2
PR = QR+PQ
= QR+1 ----> QR = PR-1
pers 1 :
..pers 3
pers 2 : PR =
subtitusi pers 2 ke pers 3
------------------------------------------- x tg γ
RS tg γ = (RS - tg γ) tg α
= RS tg α - tg γ.tg α
RS tg α - RS tg γ = tg γ.tg α
RS (tg α - tg γ) = tg γ.tg α