42
MCQ (Single Correct Answer)
The value of $\tan 3 A-\tan 2 A-\tan A$ is
A
$\tan 3 A \tan 2 A \tan A$
B
$-\tan 3 A \tan 2 A \tan A$
C
$\tan A \tan 2 A-\tan 2 A \tan 3 A-\tan 3 A \tan A$
D
None of the above
43
MCQ (Single Correct Answer)
The value of $\sin (45 \Upsilon+\theta)-\cos (45 \Upsilon-\theta)$ is
A
$2 \cos \theta$
B
$2 \sin \theta$
C
1
D
0
44
MCQ (Single Correct Answer)
The value of $\cot \left(\frac{\pi}{4}+\theta\right) \cot \left(\frac{\pi}{4}-\theta\right)$ is
A
$$-$$1
B
0
C
1
D
Not defined
45
MCQ (Single Correct Answer)
$\cos 2 \theta \cos 2 \phi+\sin ^2(\theta-\phi)-\sin ^2(\theta+\phi)$ is equal to
A
$\sin 2(\theta+\phi)$
B
$\cos 2(\theta+\phi)$
C
$\sin 2(\theta-\phi)$
D
$\cos 2(\theta-\phi)$
46
MCQ (Single Correct Answer)
The value of $\cos12\Upsilon+\cos84\Upsilon+\cos156\Upsilon+\cos132\Upsilon$ is
A
$\frac{1}{2}$
B
1
C
$-\frac{1}{2}$
D
$\frac{1}{8}$