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Hitung nilai berikut.

Hitung nilai berikut.

begin mathsize 14px style sin open parentheses fraction numerator 3 straight pi over denominator 4 end fraction close parentheses times sin open parentheses straight pi over 4 close parentheses plus cos open parentheses fraction numerator 3 straight pi over denominator 4 end fraction close parentheses times cos open parentheses straight pi over 4 close parentheses end style 

Jawaban:

begin mathsize 14px style sin open parentheses fraction numerator 3 straight pi over denominator 4 end fraction close parentheses times sin open parentheses straight pi over 4 close parentheses plus cos open parentheses fraction numerator 3 straight pi over denominator 4 end fraction close parentheses times cos open parentheses straight pi over 4 close parentheses equals sin open parentheses straight pi minus straight pi over 4 close parentheses times sin open parentheses straight pi over 4 close parentheses plus cos open parentheses straight pi minus straight pi over 4 close parentheses times cos open parentheses straight pi over 4 close parentheses equals sin open parentheses straight pi over 4 close parentheses times sin open parentheses straight pi over 4 close parentheses minus cos open parentheses straight pi over 4 close parentheses times cos open parentheses straight pi over 4 close parentheses equals open parentheses sin open parentheses straight pi over 4 close parentheses close parentheses squared minus open parentheses cos open parentheses straight pi over 4 close parentheses close parentheses squared equals open parentheses 1 half square root of 2 close parentheses squared minus open parentheses 1 half square root of 2 close parentheses squared equals 0 end style 

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