WBJEE 2020 Math Solved Paper

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Question : 10 of 75
 
Marks: +1, -0
If x‌sin(
y
x
)
‌d
‌y
=[y‌sin(
y
x
)
−x
]
d
x
,x>0
and y(1)=
Ï€
2
then the value of cos(
y
x
)
is
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