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Byju's Answer
Standard X
Mathematics
Complementary Trigonometric Ratios
Evaluate si...
Question
Evaluate
sin
18
∘
cos
72
∘
.
Open in App
Solution
sin
18
∘
cos
72
∘
=
s
i
n
18
0
c
o
s
(
90
−
18
)
=
s
i
n
18
0
s
i
n
18
0
=
1
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