1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { The expression } \frac{1-\tan ^2\left(\frac{\pi}{4}-A\right)}{1+\tan ^2\left(\frac{\pi}{4}-A\right)} \text { equals } $$

A

$\sin A$

B

$\sin 2 A$

C

$\cos A$

D

$\cos 2 A$

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The behaviour of the function $f(x)=\sin \left(2 x+\frac{\pi}{4}\right)$ on $\left(\frac{3 \pi}{8}, \frac{5 \pi}{8}\right)$ is:

A

Strictly increasing on $\left(\frac{3 \pi}{8}, \frac{5 \pi}{8}\right)$

B

Strictly increasing on $\left(\frac{\pi}{8}, \frac{3 \pi}{8}\right)$

C

Strictly decreasing on $\left(\frac{3 \pi}{8}, \frac{5 \pi}{8}\right)$

D

${\text { Strictly decreasing on }}\left(\frac{\pi}{8}, \frac{5 \pi}{8}\right)$

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { The particular solution of the equation } \sin \left(\frac{d y}{d x}\right)=a \text {, where } a \in \mathbb{R} \text { and } y=2 \text { when } x=0 \text { is } $$

A

$$ \sin \left(\frac{y-2}{x}\right)=a $$

B

$$ \sin \left(\frac{x-2}{y}\right)=a $$

C

$$ \sin \left(\frac{y+2}{x}\right)=a $$

D

$$ \sin \left(\frac{x}{y-2}\right)=a $$

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \begin{aligned} &\text { Find the co-ordinates of the orthocentre of the triangle formed by the lines }\\ &\begin{aligned} & L_1: y-x=2 \\ & L_2: y+2 x=8 \\ & L_3: 3 y-x=18 \end{aligned} \end{aligned} $$

A
(2, 4)
B
$$ \left(\frac{22}{7}, \frac{43}{7}\right) $$
C

$$ \left(\frac{10}{7}, \frac{40}{7}\right) $$

D

(6, 8)