Pertanyaan

Jika BC = CD, maka cos B adalah...

$fraction numerator 2 space tan space x over denominator square root of 4 plus tan squared space x end root end fraction$
$fraction numerator tan space x space over denominator square root of 4 plus tan squared space x end root end fraction$
$fraction numerator 2 space tan squared space x space over denominator square root of 4 plus tan squared space x end root end fraction$
$fraction numerator 2 over denominator square root of 4 plus tan squared space x end root end fraction$
$fraction numerator 2 space over denominator tan space x square root of 4 plus tan squared space x end root end fraction$

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K. Putri

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Ganesha

Jawaban terverifikasi

Pembahasan

$tan space x equals fraction numerator A D over denominator C D end fraction A D equals space C D space tan space x B C equals C D rightwards arrow B D equals 2 space C D A B equals square root of B D squared plus A D squared end root A B equals square root of left parenthesis 2 C D right parenthesis squared plus left parenthesis C D space tan space x right parenthesis squared end root A B equals square root of C D squared left parenthesis 4 plus tan squared x right parenthesis end root A B equals C D square root of left parenthesis 4 plus tan squared x right parenthesis end root cos space B equals fraction numerator B D over denominator A B end fraction cos space B equals fraction numerator 2 C D over denominator C D square root of left parenthesis 4 plus tan squared x right parenthesis end root end fraction cos space B equals fraction numerator 2 over denominator square root of 4 plus tan squared x end root end fraction$