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Easy

Question

L t subscript x not stretchy rightwards arrow 0 end subscript fraction numerator 3 sin space x minus sin space 3 x over denominator x cubed end fraction

  1.  
  2.  
  3. open parentheses pi over 180 close parentheses cubed   
  4. 4 open parentheses pi over 180 close parentheses cubed   

The correct answer is: 4 open parentheses pi over 180 close parentheses cubed 


    limit as x rightwards arrow 0 of open parentheses fraction numerator 3 sin x minus sin 3 x over denominator x cubed end fraction close parentheses
equals limit as x rightwards arrow 0 of open parentheses fraction numerator 4 sin cubed x over denominator x cubed end fraction close parentheses
equals open parentheses straight pi over 180 close parentheses cubed limit as x rightwards arrow 0 of open parentheses fraction numerator 4 sin cubed open parentheses begin display style straight pi over 180 x end style close parentheses over denominator x cubed open parentheses straight pi over 180 close parentheses cubed end fraction close parentheses
equals open parentheses straight pi over 180 close parentheses cubed limit as x rightwards arrow 0 of 4 open parentheses fraction numerator sin open parentheses begin display style straight pi over 180 end style x close parentheses over denominator open parentheses straight pi over 180 x close parentheses end fraction close parentheses cubed
equals open parentheses straight pi over 180 close parentheses cubed cross times 4 cross times 1
equals 4 open parentheses straight pi over 180 close parentheses cubed

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