lim x->0 cos x - cos a/ x-a
Matematika
Fenny081220
Pertanyaan
lim x->0 cos x - cos a/ x-a
1 Jawaban
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1. Jawaban BLUEREAPER
cos x - cos a = -2sin(x+a)/2 sin(x-a)/2
limit (-2sin(x+a)/2 sin(x-a)/2) / (x-a)
x->0
= limit - sin(x+a)/2 = -sin a/2
--x->0