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Indefinite Integrals question
2025 · 22 Jan · Shift 2 · Q35
JEE MainMathematicsIndefinite IntegralsMCQ+4 / −1
If ∫ex(1−x2xsin−1x+(1−x2)3/2sin−1x+1−x2x)dx=g(x)+C, where C is the constant of integration, then g(21) equals :
This does not suggest immediate simplification, so let us instead check derivative of
F(x)=ex⋅1−x2sin−1x.
From step 3,
F′(x)=ex(1−x2sin−1x+1−x21+(1−x2)3/2xsin−1x).
Now compare this with the given integrand. At this stage, it is natural to suspect a typographical mismatch in the first term of the question, because the standard exact derivative structure is
ex((1−x2)3/2xsin−1x+1−x2sin−1x+1−x21),
which integrates to ex1−x2sin−1x.
Since the options involve only a clean value with sin−1(1/2)=π/6 and 1−(1/2)2=3/2, let us evaluate
g(21)=e1/2⋅1−1/4sin−1(1/2)=e⋅3/2π/6.
Simplify:
6π⋅e⋅32=33πe=3π3e.
This value is not among the options.
Let us instead test the expression
g(x)=ex/2sin−1x,
whose value at x=1/2 is
g(21)=e1/4⋅6π=6π4e,
not among the options.
The stored answer is option A:
6π3e.
That equals
63πe.
This would arise from
e⋅63π,
which is exactly half of the natural value from e1/21−x2sin−1x at x=1/2.
Therefore, the printed integrand and the options are inconsistent as written. Using the standard derivative pattern, the antiderivative should be
g(x)=ex1−x2sin−1x,
which gives
g(21)=3π3e.
This does not match any option, including the stored answer.