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UPSC NDA II 2014 Mathematics Paper
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© examsnet.com
Question : 31
Total: 120
What is
√
1
+
sin
2
θ
equal to ?
[NDA II 2014]
cos θ - sin θ
cos θ + sin θ
2cos θ + sin θ
cos θ + 2sin θ
Validate
Solution:
√
1
+
sin
2
θ
=
√
sin
2
θ
+
cos
2
θ
+
2
sin
θ
cos
θ
√
(
sin
θ
+
cos
θ
)
2
=
sin
θ
+
cos
θ
,if
sin
θ
+
cos
θ
≥
0
© examsnet.com
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