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1
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)  +4  -1
If $$\int\limits_0^{100\pi } {{{{{\sin }^2}x} \over {{e^{\left( {{x \over \pi } - \left[ {{x \over \pi }} \right]} \right)}}}}dx = {{\alpha {\pi ^3}} \over {1 + 4{\pi ^2}}},\alpha \in R} $$ where [x] is the greatest integer less than or equal to x, then the value of $$\alpha$$ is :
A
200 (1 $$-$$ e$$-$$1)
B
100 (1 $$-$$ e)
C
50 (e $$-$$ 1)
D
150 (e$$-$$1 $$-$$ 1)
2
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)  +4  -1
If [x] denotes the greatest integer less than or equal to x, then the value of the integral $$\int_{ - \pi /2}^{\pi /2} {[[x] - \sin x]dx} $$ is equal to :
A
$$-$$ $$\pi$$
B
$$\pi$$
C
0
D
1
3
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)  +4  -1
If the real part of the complex number $${(1 - \cos \theta + 2i\sin \theta )^{ - 1}}$$ is $${1 \over 5}$$ for $$\theta \in (0,\pi )$$, then the value of the integral $$\int_0^\theta {\sin x} dx$$ is equal to:
A
1
B
2
C
$$-$$1
D
0
4
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)  +4  -1
Let y = y(x) satisfies the equation $${{dy} \over {dx}} - |A| = 0$$, for all x > 0, where $$A = \left[ {\matrix{ y & {\sin x} & 1 \cr 0 & { - 1} & 1 \cr 2 & 0 & {{1 \over x}} \cr } } \right]$$. If $$y(\pi ) = \pi + 2$$, then the value of $$y\left( {{\pi \over 2}} \right)$$ is :
A
$${\pi \over 2} + {4 \over \pi }$$
B
$${\pi \over 2} - {1 \over \pi }$$
C
$${{3\pi } \over 2} - {1 \over \pi }$$
D
$${\pi \over 2} - {4 \over \pi }$$
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