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Pertanyaan

Diketahui Jika 0 < θ < π , maka ....

Diketahui begin mathsize 14px style f open parentheses theta close parentheses equals 1 minus cos invisible function application theta minus fraction numerator cos squared invisible function application theta over denominator 2 end fraction minus fraction numerator cos cubed invisible function application theta over denominator 3 end fraction minus fraction numerator cos to the power of 4 invisible function application theta over denominator 4 end fraction minus horizontal ellipsis end style

Jika , maka begin mathsize 14px style f to the power of apostrophe open parentheses theta close parentheses equals end style....

  1. begin mathsize 14px style fraction numerator sin invisible function application theta over denominator 1 minus cos invisible function application theta end fraction end style  

  2. fraction numerator size 14px cos size 14px invisible function application size 14px theta over denominator size 14px 1 size 14px minus size 14px sin size 14px invisible function application size 14px theta end fraction  

  3. fraction numerator size 14px sin size 14px invisible function application size 14px theta over denominator size 14px 1 size 14px plus size 14px cos size 14px invisible function application size 14px theta end fraction  

  4. fraction numerator size 14px cos size 14px invisible function application size 14px theta over denominator size 14px 1 size 14px plus size 14px sin size 14px invisible function application size 14px theta end fraction  

  5. fraction numerator size 14px cos size 14px invisible function application size 14px theta over denominator size 14px 1 size 14px plus size 14px cos size 14px invisible function application size 14px theta end fraction  

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah A.

jawaban yang tepat adalah A.

Pembahasan

Perhatikan bahwa Perhatikan bahwa untuk maka sehingga membentuk deret geometri tak hingga dengan dan Maka Jadi, jawaban yang tepat adalah A.

Perhatikan bahwa
begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis theta right parenthesis end cell equals cell 1 minus cos invisible function application theta minus fraction numerator cos squared invisible function application theta over denominator 2 end fraction end cell row blank blank cell negative fraction numerator cos cubed invisible function application theta over denominator 3 end fraction minus fraction numerator cos to the power of 4 invisible function application theta over denominator 4 end fraction minus midline horizontal ellipsis end cell row cell f apostrophe left parenthesis theta right parenthesis end cell equals cell negative left parenthesis negative sin invisible function application theta right parenthesis minus fraction numerator 2 cos invisible function application theta left parenthesis negative sin invisible function application theta right parenthesis over denominator 2 end fraction end cell row blank blank cell negative fraction numerator 3 cos squared invisible function application theta left parenthesis negative sin invisible function application theta right parenthesis over denominator 3 end fraction minus fraction numerator 4 cos cubed invisible function application theta left parenthesis negative sin invisible function application theta right parenthesis over denominator 4 end fraction minus midline horizontal ellipsis end cell row cell f apostrophe left parenthesis theta right parenthesis end cell equals cell sin invisible function application theta plus cos invisible function application theta space sin invisible function application theta end cell row blank blank cell plus cos squared invisible function application theta space sin invisible function application theta plus cos cubed invisible function application theta space sin theta plus midline horizontal ellipsis end cell row cell f apostrophe left parenthesis theta right parenthesis end cell equals cell sin invisible function application theta left parenthesis 1 plus cos invisible function application theta plus cos squared invisible function application theta plus cos cubed invisible function application theta plus midline horizontal ellipsis right parenthesis end cell end table end style

Perhatikan bahwa untuk begin mathsize 14px style 0 less than theta less than pi comma end style maka begin mathsize 14px style negative 1 less than cos invisible function application theta less than 1 comma end style sehingga 

begin mathsize 14px style 1 plus cos invisible function application theta plus space cos squared invisible function application theta plus cos cubed invisible function application theta plus midline horizontal ellipsis end style

membentuk deret geometri tak hingga dengan begin mathsize 14px style a equals 1 end style dan size 14px r size 14px equals size 14px cos size 14px invisible function application size 14px theta size 14px.

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f apostrophe left parenthesis theta right parenthesis end cell equals cell sin invisible function application theta left parenthesis 1 plus cos invisible function application theta plus cos squared invisible function application theta plus cos cubed invisible function application theta plus midline horizontal ellipsis right parenthesis end cell row blank equals cell sin invisible function application theta open parentheses fraction numerator 1 over denominator 1 minus cos invisible function application theta end fraction close parentheses end cell row blank equals cell fraction numerator sin invisible function application theta over denominator 1 minus cos invisible function application theta end fraction end cell end table end style

Jadi, jawaban yang tepat adalah A.

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