1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The equation $$8 x^2-24 x y+18 y^2-6 x+9 y-5=0$$ represents a

A
pair of perpendicular lines
B
pair of parallel lines
C
pair of coincident lines
D
parabola
2
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Find the angle between the pair of lines represented by the equation $$x^2+4 x y+y^2=0$$.

A
30$$\Upsilon$$
B
45$$\Upsilon$$
C
60$$\Upsilon$$
D
90$$\Upsilon$$
3
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the acute angle between lines $$a x^2+2 h x y+b y^2=0$$ is $$\frac{\pi}{4}$$, then $$4 h^2$$ is equal to

A
$$a^2+4 a b+b^2$$
B
$$a^2+6 a b+b^2$$
C
$$(a-2 b)(2 a+b)$$
D
$$a^2-6 a b+b^2$$
4
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The angle between the lines represented by $$\cos \theta(\cos \theta+1) x^2-\left(2 \cos \theta+\sin ^2 \theta\right) x y+(1-\cos \theta) y^2=0$$ is

A
$$\frac{\pi}{4}$$
B
$$\frac{\pi}{6}$$
C
$$\frac{\pi}{3}$$
D
$$\frac{\pi}{12}$$
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