1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Consider a $$\Delta$$ABC satisfying $$2a{\sin ^2}\left( {{C \over 2}} \right) + 2c{\sin ^2}\left( {{A \over 2}} \right) = 2a + 2c - 3b$$
sin A, sin B, sin C are in
A
GP
B
AP
C
HP
D
Neither in GP nor in AP nor in HP
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
In a triangle ABC, a $$-$$ 2b + c = 0. The value of $$\cot \left( {{A \over 2}} \right)\cot \left( {{C \over 2}} \right)$$ is
A
$${9 \over 2}$$
B
3
C
$${3 \over 2}$$
D
1
3
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the following statements :

Statement I

If the line segment joining the points P(m, n) and Q(r, s) subtends an angle $$\alpha$$ at the origin, then $$\cos \alpha = {{ms - nr} \over {\sqrt {({m^2} + {n^2})({r^2} + {s^2})} }}$$.

Statement II

In any triangle ABC, it is true that $${a^2} = {b^2} + {c^2} - 2bc\cos A$$.

Which one of the following is correct in respect of the above two statements?
A
Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I.
B
Both Statement I and Statement II are true, but Statement II is not the correct explanation of Statement I.
C
Statement I is true, but Statement II is false.
D
Statement I is false, but Statement II is true.
4
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is the area of the triangle with vertices $$\left( {{x_1},{1 \over {{x_1}}}} \right),\left( {{x_2},{1 \over {{x_2}}}} \right),\left( {{x_3},{1 \over {{x_3}}}} \right)$$ ?
A
$$\left| {({x_1} - {x_2})({x_2} - {x_3})({x_3} - {x_1})} \right|$$
B
0
C
$$\left| {{{({x_1} - {x_2})({x_2} - {x_3})({x_3} - {x_1})} \over {{x_1}{x_2}{x_3}}}} \right|$$
D
$$\left| {{{({x_1} - {x_2})({x_2} - {x_3})({x_3} - {x_1})} \over {2{x_1}{x_2}{x_3}}}} \right|$$
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