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Nilai dari x → 0 lim ​ 3 x ⋅ cos x sin 4 x + sin 2 x ​ adalah ....

Nilai dari  adalah ....

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Master Teacher

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Ingat rumus sehingga Diperoleh hasilnya: Jadi, nilai limit di atas adalah 2

Ingat rumus sin alpha space plus space sin beta equals 2 sin 1 half open parentheses alpha plus beta close parentheses cos 1 half open parentheses alpha minus beta close parentheses sehingga

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space 4 x space plus space sin space 2 x end cell equals cell 2 sin 1 half open parentheses 4 x plus 2 x close parentheses cos 1 half open parentheses 4 x minus 2 x close parentheses space end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 2 sin 1 half open parentheses 6 x close parentheses cos 1 half open parentheses 2 x close parentheses space end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 2 sin left parenthesis 3 x right parenthesis cos left parenthesis x right parenthesis end cell end table

Diperoleh hasilnya:

table attributes columnalign right center left columnspacing 0px end attributes row cell limit as x rightwards arrow 0 of fraction numerator sin space 4 x plus space sin space 2 x over denominator 3 x times cos space x end fraction end cell equals cell limit as x rightwards arrow 0 of fraction numerator 2 space sin space 3 x times cos space x over denominator 3 x times cos space x end fraction end cell row blank equals cell limit as x rightwards arrow 0 of fraction numerator 2 space sin space 3 x over denominator 3 x end fraction end cell row blank equals cell 2 times limit as x rightwards arrow 0 of fraction numerator sin space 3 x over denominator 3 x end fraction space space space space space space space space space space space space bold space bold lim with bold x bold rightwards arrow bold 0 below fraction numerator bold sin bold space bold ax over denominator bold bx end fraction bold equals bold a over bold b end cell row blank equals cell 2 times 3 over 3 end cell row blank equals cell 2 times 1 end cell row blank equals 2 end table

Jadi, nilai limit di atas adalah 2

 

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