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Let f : [-10, 10] -> [a, b], f(x)=tan^(-...

Let `f : [-10, 10] -> [a, b]`, `f(x)=tan^(-1)(x) + sinx + 3x^3 - x` be an onto function, then `(A)` `2a + blt0` `(B)` `3a +bgt0` `(C)` `a + 2blt0` `(D)` `3a + 4blt0`

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