1
TS EAMCET 2022 (Online) 18th July Evening Shift
MCQ (Single Correct Answer)
+1
-0
  1. If $\cos \alpha+\cos \beta+\cos \gamma=0$ and $\sin \alpha+\sin \beta+\sin \gamma=0$ then $\cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma=$
A

$\frac{3}{2}$

B

$\cos ^2 \frac{\alpha}{2}+\cos ^2 \frac{\beta}{2}+\cos ^2 \frac{\gamma}{2}$

C

$3 \sin (\alpha+\beta+\gamma)$

D

$\cos (\alpha+\beta)+\cos (\beta+\gamma)+\cos (\gamma+\alpha)$

2
TS EAMCET 2022 (Online) 18th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

One of the values of $(-32 i)^{\frac{2}{5}}$ is

A

$4 \operatorname{cis} \frac{2 \pi}{5}$

B

$4 \operatorname{cis} \frac{3 \pi}{5}$

C

$4 \operatorname{cis} \frac{4 \pi}{5}$

D

$4 \operatorname{cis} \frac{6 \pi}{5}$

3
TS EAMCET 2022 (Online) 18th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the quadratic equations $x^2-7 x+3 c=0$ and $x^2+x-5 c=0$ have a common root, then for non-zero real value of $c$ the sign of the expression $x^2-3 x+c$ is

A

negative for all $x \in R$

B

positive for all $x \in(1,3)$

C

negative for all $x \in(1,3)$

D

positive for all $x \in R$

4
TS EAMCET 2022 (Online) 18th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

II. Let $f(x)=\frac{6 x^2-18 x+21}{6 x^2-18 x+17}$. If $m$ is the maximum value of $f(x)$ and $f(x)>n \forall x \in R$. Then, $14 m-7 n=$

A

-1

B

23

C

35

D

42

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