1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { If } y=\sin ^{-1}(\sqrt{\sin x}) \text {, then } \frac{d y}{d x} \text { equals } $$

A
$$ \frac{1}{2} \sqrt{1-\operatorname{cosec} x} $$
B
$$ \frac{1}{2} \sqrt{1-\sin x} $$
C
$$ \frac{1}{2} \sqrt{1+\operatorname{cosec} x} $$
D
$$ \frac{1}{2} \sqrt{1+\sin x} $$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Let a, b, c be three vector such that $$a \neq 0$$ and $$\vec{a} \times \vec{b}=2 \vec{a} \times \vec{c},|a|=|c|=1,|b|=4$$ and $$|\vec{b} \times \vec{c}|=\sqrt{15}$$. If $$\vec{b}-2 \vec{c}=\lambda \vec{a}$$ then $$\lambda$$ equals to

A
2
B
1
C
$$-1$$
D
$$-4$$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$$\text { Which of the following function is injective? }$$

A
$$ f(x)=x^2+2, x \in(-\infty, \infty) $$
B
$$ f(x)=|x+2|, x \in[-2, \infty) $$
C
$$ f(x)=\frac{4 x^2+3 x-5}{4+3 x-5 x^2}, x \in(-\infty, \infty) $$
D
$$ f(x)=(x-4)(x-5), x \in(-\infty, \infty) $$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$$ \int_\limits{-\frac{\pi}{2}}^{\frac{\pi}{2}} \sqrt{\cos x-\cos ^3 x} d x \text { is equal to } $$

A
$$ \frac{4}{3} $$
B
$$ -\frac{1}{3} $$
C
0
D
$$ -\frac{2}{3} $$
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