given y=cot(x-3.14/2)

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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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