jika A+B=180.,maka cos A+2 cos B
Matematika
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Pertanyaan
jika A+B=180.,maka cos A+2 cos B
1 Jawaban
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1. Jawaban MuhTaufiqMukhtar
A+B=180
B=180-A
cosA+2cosB
= cosA+2cos(180-A)
= cosA+2.-cosA
= cosA-2cosA
= -cosA