1
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

If $$n$$ is the number of solutions of the equation $$2 \cos x\left(4 \sin \left(\frac{\pi}{4}+x\right) \sin \left(\frac{\pi}{4}-x\right)-1\right)=1, x \in[0, \pi]$$ and $$S$$ is the sum of all these solutions, then the ordered pair $$(n, S)$$ is

A
$$(3,13 \pi / 9)$$
B
$$(2,2 \pi / 3)$$
C
$$(2,8 \pi / 9)$$
D
$$(3,5 \pi / 3)$$
2
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

The upper $$(\frac{3}{4})$$ th portion of a vertical pole subtends an angel $$\tan ^{-1}\left(\frac{3}{5}\right)$$ at a point in the horizontal plane through its foot and at a distance $$40 \mathrm{~m}$$ from the foot. A possible height of the vertical is

A
80 m
B
20 m
C
40 m
D
60 m
3
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

If $$y=m_1 x+c_1$$ and $$y=m_2 x+c_2, m_1 \neq m_2$$ are two common tangents of circle $$x^2+y^2=2$$ and parabola $$y^2=x$$, then the value of $$8\left|m_1 m_2\right|$$ is equal to

A
$$7+6 \sqrt{2}$$
B
$$3+4 \sqrt{2}$$
C
$$-5+6 \sqrt{2}$$
D
$$-4+3 \sqrt{2}$$
4
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

The number of words (with or without meaning) that can be formed from all the letters of the word "LETTER" in which vowels never come together is

A
80
B
100
C
120
D
140
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