WBJEE 2023 Math Solved Paper

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Question : 13 of 75

Marks: +1, -0

Given ‌

d2y

dx2

+cot‌x‌

dy

dx

+4y‌cos‌e‌c2‌x=0. Changing the independent variable x to z by the substitution z=log‌tan‌

x

2

, the equation is changed to

‌
d2y
dz2
+‌
3
y
=0
2‌
d2y
dz2
+ey=0
‌
d2y
dz2
−4y=0
‌
d2y
dz2
+4y=0

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