1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the value of $$\cos 46^\circ \cos 47^\circ \cos 48^\circ \cos 49^\circ \cos 50^\circ .......\cos 135^\circ $$ ?
A
$$-$$ 1
B
0
C
1
D
Greater than 1
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$\sin 2\theta = \cos 3\theta $$, where $$0 < \theta < {\pi \over 2}$$, then what is sin$$\theta$$ equal to?
A
$${{\sqrt 5 + 1} \over 4}$$
B
$${{\sqrt 5 - 1} \over 4}$$
C
$${{\sqrt 5 + 1} \over {16}}$$
D
$${{\sqrt 5 - 1} \over {16}}$$
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If the roots of the equation $${x^2} + px + q = 0$$ are tan 19$$^\circ$$ and tan 26$$^\circ$$, then which one of the following is correct?
A
q $$-$$ p = 1
B
p $$-$$ q = 1
C
p + q = 2
D
p + q = 3
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is $${(1 + \tan \alpha \tan \beta )^2} + {(\tan \alpha - \tan \beta )^2} - {\sec ^2}\beta {\sec ^2}\beta $$ equal to?
A
0
B
1
C
2
D
4
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