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NDA Math Trigonometric Ratios of Angles and Equations
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© examsnet.com
Question : 26
Total: 100
What is
sin
105
∘
+
cos
105
∘
equal to?
[NDA I 2018]
s
i
n
50
°
c
o
s
50
°
1
√
2
0
Validate
Solution:
sin
(
90
∘
+
15
∘
)
+
cos
105
∘
=
cos
15
∘
+
cos
105
∘
=
2
cos
60
∘
⋅
cos
45
∘
=
2
×
1
2
×
1
√
2
=
1
√
2
© examsnet.com
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