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CDS Model Paper 1 Mathematics
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© examsnet.com
Question : 51
Total: 100
The value of
cos
3
θ
+
sin
3
θ
cos
θ
+
sin
θ
+
cos
3
θ
−
sin
3
θ
cos
θ
−
sin
θ
is equal to
−
1
1
2
0
Validate
Solution:
(
cos
θ
+
sin
θ
)
(
cos
2
θ
+
sin
2
θ
−
sin
θ
cos
θ
)
(
cos
θ
+
sin
θ
)
+
(
cos
θ
−
sin
θ
)
(
cos
2
θ
+
sin
2
θ
+
sin
θ
cos
θ
)
(
cos
θ
−
sin
θ
)
=
2
cos
2
θ
+
2
sin
2
θ
−
sin
θ
cos
θ
+
sin
θ
cos
θ
=
2
© examsnet.com
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