cos(x-y) = -1,maka cos x + cos y =.....
Matematika
Daraninggar23
Pertanyaan
cos(x-y) = -1,maka cos x + cos y =.....
1 Jawaban
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1. Jawaban dharmawan12
cos (x - y) = -1
cos (x - y ) = cos 180
x - y = 180
x = 180 + y (subsitusikan ke cos x + cos y
= cos (180 + y ) + cos y
= - cos y + cos y
= 0