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JEE Main 11 Jan 2019 Shift 1 Solved Paper

Section: Mathematics
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Question : 47 of 90
 
Marks: +1, -0
Let fk (x) =
1
k
(sinkx+coskx) for k = 1 , 2 , 3 , ... Then for all x ∊ R, the value of f4 (x) - f6 (x) is equal to :
[11 Jan 2019 Shift 1]
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