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KCET 2019 Math Solved Paper
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© examsnet.com
Question : 55
Total: 60
If x = a
s
e
c
2
θ, y = a
t
a
n
2
θ then
d
2
y
d
x
2
=
1
4
2a
0
Validate
Solution:
(D)
d
x
d
θ
=
2
a
sec
2
θ
tan
θ
d
y
d
θ
=
2
a
tan
θ
sec
2
θ
∴
d
y
d
x
=
d
y
d
x
d
x
d
θ
=
2
a
tan
θ
sec
2
θ
2
a
tan
θ
sec
2
θ
=
1
∴
d
2
y
d
x
2
= 0
© examsnet.com
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