1
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $\alpha=\frac{\sin ^3 x}{\cos ^2 x}, \beta=\frac{\cos ^3 x}{\sin ^2 x}$ and $\sin x+\cos x=k$, then $\alpha \sin x+\beta \cos x+3=$

A

$\frac{2}{\left(k^2-1\right)^2}$

B

$\frac{4}{\left(k^2-1\right)^2}$

C

$\frac{k^2-1}{2}$

D

$\frac{\left(k^2-1\right)^2}{4}$

2
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $A+B+C=60^{\circ}$, then $\cos \left(30^{\circ}-A\right)+\cos \left(30^{\circ}-B\right)+\cos \left(30^{\circ}-C\right)+\sin (A+B+C)=$

A

$4 \cos \frac{A}{2} \cos \frac{B}{2} \cos \frac{C}{2}$

B

$4 \sin \frac{A}{2} \sin \frac{B}{2} \sin \frac{C}{2}$

C

$4 \cos \frac{A}{2} \cos \frac{B}{2} \sin \frac{C}{2}$

D

$4 \cos \frac{A}{2} \sin \frac{B}{2} \cos \frac{C}{2}$

3
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $\left|\sin x-\cos ^2 x\right| \geq\left|3-3 \sin x+\sin ^2 x\right|+4|\sin x-1|$, then $x=$

A

$(4 n+1) \frac{\pi}{2}, n \in Z$

B

$2 n \pi+\frac{\pi}{3}, n \in Z$

C

$n \pi+\frac{\pi}{2}, n \in \mathbf{Z}$

D

$2 n \pi+\frac{\pi}{6}, n \in \mathbf{Z}$

4
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The number of real roots of the equation $\sin \left[2 \cos ^{-1}\left\{\cot \left(2 \tan ^{-1} x\right)\right\}\right]=0$ that are greater than or equal to one are

A

1

B

2

C

3

D

4

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