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Buktikan: sin 3 B + ( cos B + sin B ) ( 1 − 2 sin 2 B ) = cos 3 B

Buktikan:

 

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W. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

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terbukti bahwa .

terbukti bahwa sin space 3 straight B plus open parentheses cos space straight B plus sin space straight B close parentheses open parentheses 1 minus 2 space sin space 2 straight B close parentheses equals cos space 3 straight B

Pembahasan

Ingat kembali: Akan dibuktikan . Maka: Jadi, terbukti bahwa .

Ingat kembali:

2 space sin space straight alpha space cos space straight beta equals sin space open parentheses straight alpha plus straight beta close parentheses plus sin space open parentheses straight alpha minus straight beta close parentheses 

Akan dibuktikan sin space 3 straight B plus open parentheses cos space straight B plus sin space straight B close parentheses open parentheses 1 minus 2 space sin space 2 straight B close parentheses equals cos space 3 straight B. Maka:

 table attributes columnalign right center left columnspacing 0px end attributes row cell Ruas space kiri end cell equals cell sin space 3 straight B plus open parentheses cos space straight B plus sin space straight B close parentheses open parentheses 1 minus 2 space sin space 2 straight B close parentheses end cell row blank equals cell sin space 3 straight B plus cos space straight B minus 2 space sin space 2 straight B space cos space straight B plus sin space straight B minus 2 space sin space 2 straight B space sin space straight B end cell row blank equals cell sin space 3 straight B plus cos space straight B minus open square brackets sin space open parentheses 2 straight B plus straight B close parentheses plus sin space open parentheses 2 straight B minus straight B close parentheses close square brackets plus sin space straight B minus open square brackets negative cos space open parentheses 2 straight B plus straight B close parentheses plus cos space open parentheses 2 straight B minus straight B close parentheses close square brackets end cell row blank equals cell sin space 3 straight B plus cos space straight B minus open parentheses sin space 3 straight B plus sin space straight B close parentheses plus sin space straight B minus open parentheses negative cos space 3 straight B plus cos space straight B close parentheses end cell row blank equals cell up diagonal strike sin space 3 straight B end strike up diagonal strike plus cos space straight B end strike up diagonal strike negative sin space 3 straight B end strike up diagonal strike negative sin space straight B end strike up diagonal strike plus sin space straight B end strike plus cos space 3 straight B up diagonal strike negative cos space straight B end strike end cell row blank equals cell cos space 3 straight B end cell end table 

Jadi, terbukti bahwa sin space 3 straight B plus open parentheses cos space straight B plus sin space straight B close parentheses open parentheses 1 minus 2 space sin space 2 straight B close parentheses equals cos space 3 straight B

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