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Diketahui fungsi f dinyatakan oleh f ( x ) = cotan 5 2 x . Turunan pertama dari f yaitu f'. Tentukan : a. bentuk f ( x ) b. nilai f ( 6 π ​ )

Diketahui fungsi f dinyatakan oleh . Turunan pertama dari f yaitu f'. Tentukan :

a. bentuk  

b. nilai   

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N. Sari

Master Teacher

Mahasiswa/Alumni Universitas Nasional

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Pembahasan

Ingat aturan rantai turunan fungsi trigonometri : Misalkan , maka . Misalkan , kita nyatakan dalam . Maka . Misalkan , kita nyatakan dalam . Maka . Sehingga turunan pertamanya : Maka, . Nilai : Maka, nilai .

Ingat aturan rantai turunan fungsi trigonometri :

fraction numerator d y over denominator d x end fraction equals fraction numerator d y over denominator d u end fraction cross times fraction numerator d u over denominator d x end fraction  

Misalkan u equals 2 x, maka fraction numerator d u over denominator d x end fraction equals 2.

Misalkan v equals co tan space 2 x, kita nyatakan dalam v equals co tan space u. Maka fraction numerator d v over denominator d u end fraction equals negative cosec squared space u.

Misalkan y equals cotan to the power of 5 space 2 x, kita nyatakan dalam y equals v to the power of 5. Maka fraction numerator d y over denominator d v end fraction equals 5 v to the power of 4.  

Sehingga turunan pertamanya :

table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator d y over denominator d x end fraction end cell equals cell fraction numerator d y over denominator d v end fraction cross times fraction numerator d v over denominator d u end fraction cross times fraction numerator d u over denominator d x end fraction end cell row blank equals cell 2 times negative cosec squared space u times 5 v to the power of 4 end cell row blank equals cell negative 10 v to the power of 4 times cosec squared space u end cell row blank equals cell negative 10 times co tan to the power of 4 space 2 x times cosec squared space 2 x end cell end table

Maka,  table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe left parenthesis x right parenthesis end cell equals cell negative 10 times co tan to the power of 4 space 2 x times cosec squared space 2 x end cell end table.

Nilai f apostrophe open parentheses straight pi over 6 close parentheses :

table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe left parenthesis x right parenthesis end cell equals cell negative 10 times co tan to the power of 4 space 2 x times cosec squared space 2 x end cell row cell f apostrophe open parentheses straight pi over 6 close parentheses end cell equals cell negative 10 times cotan to the power of 4 space 2 open parentheses straight pi over 6 close parentheses times cosec squared space 2 open parentheses straight pi over 6 close parentheses end cell row blank equals cell negative 10 times cotan to the power of 4 open parentheses 60 degree close parentheses times cosec squared open parentheses 60 degree close parentheses end cell row blank equals cell negative 10 cross times fraction numerator 1 over denominator square root of 3 end fraction cross times fraction numerator 2 over denominator square root of 3 end fraction end cell row blank equals cell negative 20 over 3 end cell end table   

Maka, nilai table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe open parentheses straight pi over 6 close parentheses end cell equals cell negative 20 over 3 end cell end table.

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