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Ketika berada di kuadran I dan II, grafik fungsi f ( x) = 2 sin 2 x - 60 ° akan cekung ke atas pada saat ….

Ketika berada di kuadran I dan II, grafik fungsi f (x) = 2 sin 2x-60°  akan cekung ke atas pada saat ….

  1. 30 degree less than x less than 120 degree  

  2. space x less than 30 degree space atau space x greater than 120 degree  

  3. 0 to the power of o less or equal than x less than 30 to the power of o space atau space 120 to the power of o less than x less or equal than 180 to the power of o  

  4. x less or equal than 30 degree space atau space x greater or equal than 120 degree  

  5. 30 degree less or equal than x less or equal than 120 degree  

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S. Dwi

Master Teacher

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Pembahasan

Menentukan turunan pertama dan kedua dari fungsi f ( x) =2 sin ( 2 x - 60° ) Syarat cekung ke atas ketika f '' ( x) >0 Solusi persamaan sinus Uji titik ke fungsi f ''( x) Karena syaratnya f ''( x) >0 (positif), maka fungsi akan cekung ke atas pada saat atau

Menentukan turunan pertama dan kedua dari fungsi f (x) =2 sin (260°)

f apostrophe left parenthesis x right parenthesis equals 4 c o s invisible function application left parenthesis 2 x minus 60 degree right parenthesis f to the power of apostrophe apostrophe end exponent left parenthesis x right parenthesis equals negative 8 s i n invisible function application left parenthesis 2 x minus 60 degree right parenthesis  

Syarat cekung ke atas ketika f '' (x) >0

f to the power of apostrophe apostrophe end exponent left parenthesis x right parenthesis greater than 0 minus 8 s i n invisible function application left parenthesis 2 x minus 60 degree right parenthesis greater than 0 P e m b u a t space n o l minus 8 s i n invisible function application left parenthesis 2 x minus 60 degree right parenthesis equals 0 s i n invisible function application left parenthesis 2 x minus 60 degree right parenthesis equals 0 s i n invisible function application left parenthesis 2 x minus 60 degree right parenthesis equals s i n invisible function application 0  

Solusi persamaan sinus

2 x minus 60 degree equals 0 degree plus k.360 degree 2 x equals 60 degree plus k.360 degree x equals 30 degree plus k.180 degree k equals 0 space m a k a space x equals 30 degree space space space space space space space space space space space space space space space space space left square bracket k u a d r a n space I space d a n space I I comma m a k a space 0 to the power of o less or equal than x less or equal than 180 to the power of o right square bracket  

2 x minus 60 degree equals 180 degree plus k.360 degree 2 x equals 240 degree plus k.360 degree x equals 120 degree plus k.180 degree k equals 0 space m a k a space x equals 120 degree space space space space space space space space space space space left square bracket k u a d r a n space I space d a n space I I comma m a k a space 0 to the power of o less or equal than x less or equal than 180 to the power of o right square bracket  

Uji titik ke fungsi f''(x)

 

Karena syaratnya f''(x)>0 (positif), maka fungsi space f left parenthesis x right parenthesis equals 2 space sin invisible function application left parenthesis 2 x minus 60 degree right parenthesis  akan cekung ke atas pada saat  0 to the power of o less or equal than x less than 30 to the power of o  atau 120 to the power of o less than x less or equal than 180 to the power of o  

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