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cos x – cos y = ....

cos x – cos y = ....

$begin mathsize 14px style 2 space cos invisible function application open parentheses fraction numerator straight x plus straight y over denominator 2 end fraction close parentheses space cos invisible function application open parentheses fraction numerator straight x minus straight y over denominator 2 end fraction close parentheses end style$
$size 14px minus size 14px 2 size 14px space size 14px cos size 14px invisible function application begin mathsize 14px style left parenthesis fraction numerator straight x plus straight y over denominator 2 end fraction right parenthesis end style size 14px space size 14px cos size 14px invisible function application begin mathsize 14px style left parenthesis fraction numerator straight x minus straight y over denominator 2 end fraction right parenthesis end style$
$begin mathsize 14px style 2 space sin invisible function application open parentheses fraction numerator straight x plus straight y over denominator 2 end fraction close parentheses space sin invisible function application open parentheses fraction numerator straight x minus straight y over denominator 2 end fraction close parentheses end style$
$begin mathsize 14px style negative 2 space sin invisible function application open parentheses fraction numerator straight x plus straight y over denominator 2 end fraction close parentheses space sin invisible function application open parentheses fraction numerator straight x minus straight y over denominator 2 end fraction close parentheses end style$
$size 14px 2 size 14px space size 14px sin size 14px invisible function application begin mathsize 14px style left parenthesis fraction numerator straight x plus straight y over denominator 2 end fraction right parenthesis end style size 14px space size 14px cos size 14px invisible function application begin mathsize 14px style left parenthesis fraction numerator straight x minus straight y over denominator 2 end fraction right parenthesis end style$

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D. Kamilia

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Mahasiswa/Alumni Universitas Negeri Malang

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$begin mathsize 14px style cos invisible function application straight alpha minus cos invisible function application straight beta equals negative 2 space sin invisible function application open parentheses fraction numerator straight alpha plus straight beta over denominator 2 end fraction close parentheses sin invisible function application open parentheses fraction numerator straight alpha minus straight beta over denominator 2 end fraction close parentheses space end style$

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