1
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $$A=\left[\begin{array}{ccc}1 & 0 & 0 \\ a & -1 & 0 \\ b & c & 1\end{array}\right]$$ is such that $$A^2=I$$, then

A
$$b=\frac{a c}{2}$$
B
$$b=-\frac{a c}{2}$$
C
$$b=\frac{a+c}{2}$$
D
$$b=\sqrt{a c}$$
2
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

Let $$A=\left[\begin{array}{ccc}-2 & x & 1 \\ x & 1 & 1 \\ 2 & 3 & -1\end{array}\right]$$. If the roots of the equation $$\operatorname{det} A=0$$ are $$l, m$$ then $$l^3-m^3=$$

A
35
B
$$-$$35
C
19
D
$$-$$19
3
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

Multiplicative inverse of the complex number $$(\sin \theta, \cos \theta)$$ is

A
$$(\sin \theta, \cos \theta)$$
B
$$(\sin \theta,-\cos \theta)$$
C
$$(\cos \theta,-\sin \theta)$$
D
$$(-\cos \theta, \sin \theta)$$
4
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$\sum_\limits{k=0}^{440} i^k=x+i y \Rightarrow x^{100}+x^{99} y+x^{242} y^2+x^{97} y^3=$$

A
0
B
$$-$$4
C
4
D
1
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