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Test Index
NDA Math Trigonometric Ratios of Angles and Equations Part 2
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© examsnet.com
Question : 36
Total: 75
What is the value of the following?
(
sin
24
∘
+
cos
66
∘
)
(
sin
24
∘
−
cos
66
∘
)
[NDA-I 2021]
−
1
0
1
2
Validate
Solution:
👈: Video Solution
Concept:
cos
(
90
∘
−
θ
)
=
sin
θ
sin
(
90
∘
−
θ
)
=
cos
θ
Calculation:
=
(
sin
24
∘
+
cos
66
∘
)
(
sin
24
∘
−
cos
66
∘
)
=
(
sin
24
∘
+
sin
(
90
∘
−
66
∘
)
)
(
sin
24
∘
−
sin
(
90
∘
−
66
∘
)
)
=
(
sin
24
∘
+
sin
24
∘
)
(
sin
24
∘
−
sin
24
∘
)
=
(
sin
24
∘
+
sin
24
∘
)
×
0
=
0
© examsnet.com
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