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sisi depan / sisi miring = 2/5 √5
sisi depan = 2
sisi miring = √5
sisi samping = √((√5)² - 2²) = √(5 - 4) = √1 = 1
cot (π/2 - x) = tan x
tan x = sisi depan / sisi samping
tan x = 2/1 = 2
maka cot (π/2 - x) adalah 2