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Nisa
Student XII IPA
- Diketahui fungsi trigonometri f(x) = 4-2 sin(It – 3x). Nilai minimum fungsi f(x) adalah... A. 6 B.2 C.-1 D.-2 E. -6
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Putra Gema Nusa
Rockstar Teacher GURU SMA
:> X = 30° f(x)=-4-2 Sın (T – 3x) 4-2 Sin 3x f(x) = 0-2.30S 3X E f(x) ': st XE So 9 3 0 0 = os 3x as 3x = los 90° = 5 # 3X = 90° +k. 360° # 3x = -90° +k. 360° X = 30° tk. 120° X=-30° + k. 120° -> k=0, X = 30 >k = , X = 90° > k=1,x=150 -> k= 2, X = 210 ° f(x) = 4 - 2 sin(T-336 - 2 (T3x f(**)= 4-2 sin (t - 3.50) 4-2 sin (90) = 4 - 2 - 2 > X = 90° f (90°) – 4 - 2 Sın (TT –3.90) - = 4-2 sin 1-90) = 4-2-1 - 4+2 +6 éNilai minimum f(x) adalah B.2 o Pahamify
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