GATE Civil Engineering (CE) 2022 Shift 1 Solved Paper

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Question : 11 of 65
 
Marks: +1, -0
Consider the following expression:
z = sin (y + it) + cos (y - it)
where z, y, and t are variables, and i = âˆš-1 is a complex number. The partial differential equation derived from the above expression is
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