180 x 10 = 1,800
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180 x (1/10) = 180/10= 18
10 x 18 = 180
180 = (1 x 100) + (8 x 10) + (0 x 1)
Three-tenth 0f 180 = 3/10 x 180 = 54
cot x = (cos x) / (sin x) cos (x - 180) = cos x cos 180 + sin x sin 180 = - cos x sin (x - 180) = sin x cos 180 - cos x sin 180 = - sin x cot (x - 180) = (cos (x - 180)) / (sin (x - 180)) = (- cos x) / (- sin x) = (cos x) / (sin x) = cot x