1
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is $$\cot \left( {{A \over 2}} \right)$$ $$-$$ $$\tan \left( {{A \over 2}} \right)$$ equal to?
A
tan A
B
cot A
C
2 tan A
D
2 cot A
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If angle C of a triangle ABC is a right angle, then what is tan A + tan B equal to?
A
$${{{a^2} - {b^2}} \over {ab}}$$
B
$${{{a^2}} \over {bc}}$$
C
$${{{b^2}} \over {ca}}$$
D
$${{{c^2}} \over {ab}}$$
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is $$\cos 80^\circ + \cos 40^\circ - \cos 20^\circ $$ equal to?
A
2
B
1
C
0
D
$$-$$ 19
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $$2\tan A = 3\tan B = 1$$, then what is $$\tan (A - B)$$ equal to?
A
$${1 \over 5}$$
B
$${1 \over 6}$$
C
$${1 \over 7}$$
D
$${1 \over 9}$$
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