January 2019 1 50 Report
Jika 0o < x < 90o maka jumlah dari

cos x + cos x sin x + cos x sin2 x+ cos x sin3 x + cos x sin4 x + ….

sama dengan …
(A) sin x / 1 - cos x

(B) cos x/ 1 + sin x

(C) cos x / 1 - cos x

(D) 1 + cos x / sin x

(E) sec x + tan x
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