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JEE Main 31-Aug-2021 Shift 1 Solved Paper

Section: Mathematics
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Question : 75 of 90
 
Marks: +1, -0
If the function
f(x)={
1
x
loge(
1+
x
a
1−
x
b
),		‌x<0
k,‌x=0
cos2x−sin2x−1
√x2+1−1
,		‌x>0
is continuous at x=0, then
1
a
+
1
b
+
4
k
 is equal to
[31 Aug 2021 Shift 1]
Validate
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