1.

If f(x)=1/9abs({:(cosx, 1, 0), (1, 2cosx, 1), (0, 1, 2cosx):}), " then " (d^(2)f)/(dx^(2))=

Answer»

`cos3x`
`cos(pi+3x)`
`SIN3X`
`sin(pi+3x)`

ANSWER :B


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