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As π= 3.14
y= cot (π/2 - x)
y= cos (π/2 - x) / sin(π/2- x)
y= (cos π/2 cos x + sin π/2 sin x) / (sin π/2 cos x - cos π/2 sin x)
y= 0 + sin x / cos x - 0
y= sin x / cos x
y= tan x
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