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Yg memenuhi hanya x = 0
sin 0 = 0
2.cos x = 0
0-0=0
sin x = 2.cos x
sin x / cos x = 2
Menjadi:
tan x = 2
x = tan⁻¹ 2
Sehingga, dengan aproksimasi kalkulator:
x ≈ 63,4°