1
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If $\tan A=\dfrac{1}{7}$, then what is cos 2A equal to?
A
$\dfrac{24}{25}$
B
$\dfrac{18}{25}$
C
$\dfrac{12}{25}$
D
$\dfrac{6}{25}$
2
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
The sides of a triangle are m, n and $\rm \sqrt{m^2+n^2+mn}$. What is the sum of the acute angles of the triangle?
A
45°
B
60°
C
75°
D
90°
3
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
What is the area of the triangle ABC with sides a = 10cm  and c = 4cm angle B = 30°?
A
16 cm2
B
12 cm2
C
10 cm2
D
8 cm2
4
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following statements:

1. A = {1, 3, 5} and B = {2, 4, 7} are equivalent sets.

2. A = {1, 5, 9} and B = {1, 5, 5, 9, 9} are equal sets.

Which of the above statements is/are correct?

A
1 only
B
2 only
C
Both 1 and 2
D
Neither 1 nor 2
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