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Test Index
NDA Math Trigonometric Ratios of Angles and Equations Part 2
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© examsnet.com
Question : 48
Total: 75
What is the value of
cos
48
°
−
cos
12
°
?
[NDA-I 2020]
√
5
−
1
4
1
−
√
5
4
√
5
+
1
2
1
−
√
5
8
Validate
Solution:
👈: Video Solution
cos
48
°
−
cos
12
°
=
2
.
sin
(
48
°
+
12
°
2
)
.
sin
(
12
°
−
48
°
2
)
=
2
.
sin
30
°
.
sin
(
−
18
°
)
=
−
sin
18
°
=
−
(
√
5
−
1
4
)
=
(
1
−
√
5
4
)
© examsnet.com
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