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NDA Math Trigonometric Ratios of Angles and Equations Part 2
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© examsnet.com
Question : 45
Total: 75
What is
sin
3
x
+
cos
3
x
+
4
sin
3
x
−
3
sin
x
+
3
cos
x
−
4
cos
3
x
equal to ?
[NDA-I 2020]
0
1
2
sin
2
x
4
cos
4
x
Validate
Solution:
👈: Video Solution
sin
3
x
+
cos
3
x
+
4
sin
3
x
−
3
sin
x
+
3
cos
x
−
4
cos
3
x
=
sin
3
x
+
cos
3
x
−
sin
3
x
−
cos
3
x
=
0
© examsnet.com
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