EAMCET Engineering 2002 Solved Paper

Section: Mathematics
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Question : 150 of 200
 
Marks: +1, -0
If ‌‌z= sec(y−ax)+tan(y+ax),‌‌ then ‌
∂2z
∂x2
−a2‌
∂2z
∂y2
is equal to
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