1
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The solution of differential equation $$y y^{\prime}=x\left(\frac{y^2}{x^2}+\frac{f\left(y^2 / x^2\right)}{f^{\prime}\left(y^2 / x^2\right)}\right)$$ is

A
$$x^2 f\left(\frac{y^2}{x^2}\right)=c$$
B
$$x^2 f\left(\frac{y^2}{x^2}\right)=c^2 y^2$$
C
$$f\left(\frac{y^2}{x^2}\right)=c x^2$$
D
$$f\left(\frac{y^2}{x^2}\right)=\frac{c y}{x}$$
2
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

For $$x \in R, f(x)=|\log 2-\sin x|$$ and $$g(x)=f(f(x))$$, then

A
$$g$$ is not differentiable at $$x=0$$
B
$$g^{\prime}(0)=\cos (\log 2)$$
C
$$g^{\prime}(0)=-\cos (\log 2)$$
D
$$g$$ is differentiable at $$x=0$$ and $$g'(0)=-\sin (\log 2)$$
3
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

$$\lim _\limits{n \rightarrow \infty}\left(\frac{(n+1)(n+2) \ldots 3 n}{n^{2 n}}\right)^{1 / n}$$ is equal to

A
$$\frac{18}{e^4}$$
B
$$\frac{27}{e^2}$$
C
$$\frac{9}{e^2}$$
D
$$3 \log 3-2$$
4
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

Let $$a, b$$ and $$c$$ be three unit vectors such that $$a \times(b \times c)=\frac{\sqrt{3}}{2}(b+c)$$. If $$b$$ is not parallel to $$c$$, then the angle between $$a$$ and $$b$$ is

A
$$\frac{3 \pi}{4}$$
B
$$\frac{\pi}{2}$$
C
$$\frac{2 \pi}{3}$$
D
$$\frac{5 \pi}{6}$$
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