1.

Let f(x)=([a]^(2)-5[a]+4)x^(3)-(6{a}^(2)-5{a}+1)x-(tan x) xx sin xbe an even function for all x in R. Then the sum of all possible values of a is (where [.] and {.} denote gretest integer function and fractional part function, respectively )

Answer»

`(17)/(6)`
`(53)/(6)`
`(31)/(3)`
`(35)/(3)`

ANSWER :D


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