Pertanyaan

Bila maka cos ( 7 0 o + x ) = ...

Bila maka $cos (7 0^{o} + x) =$ ...

$begin mathsize 14px style fraction numerator square root of 1 minus a squared end root minus a over denominator 2 end fraction end style$
$begin mathsize 14px style fraction numerator square root of 3 open parentheses 1 minus a squared close parentheses end root minus a over denominator 2 end fraction end style$
$begin mathsize 14px style fraction numerator square root of 3 open parentheses 1 minus a squared close parentheses end root plus a over denominator 2 end fraction end style$
$begin mathsize 14px style fraction numerator square root of 2 open parentheses 1 minus a squared close parentheses end root plus a over denominator 2 end fraction end style$
$begin mathsize 14px style fraction numerator square root of 2 open parentheses 1 minus a squared close parentheses end root minus a over denominator 2 end fraction end style$

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Klaim

D. Kamilia

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

Jawaban terverifikasi

Pembahasan

Diketahui : Maka: Ingat! Penjumlahan sudut cosinus : cos (A + B) = cos A . cos B – sin A . sin B Sehingga :

Diketahui :

Maka:

Ingat!

Penjumlahan sudut cosinus :

cos (A + B) = cos A . cos B – sin A . sin B

Sehingga :

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell cos invisible function application open parentheses 70 to the power of o plus x close parentheses end cell equals cell cos invisible function application open parentheses open parentheses 40 to the power of o plus x close parentheses plus 30 to the power of o close parentheses end cell row blank equals cell cos invisible function application open parentheses 40 to the power of o plus x close parentheses c o s 30 to the power of o minus sin invisible function application open parentheses 40 to the power of o plus x close parentheses s i n 30 to the power of o end cell row blank equals cell square root of 1 minus a squared end root.1 half square root of 3 minus a.1 half end cell row blank equals cell 1 half open parentheses square root of 3 left parenthesis 1 minus a squared right parenthesis end root minus a close parentheses end cell row blank equals cell fraction numerator square root of 3 left parenthesis 1 minus a squared right parenthesis end root minus a over denominator 2 end fraction end cell end table end style$

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