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Byju's Answer
Standard X
Mathematics
Trigonometric Ratios of Complementary Angles
Question 1 iE...
Question
Question 1 (i)
Evaluate :
s
i
n
18
∘
c
o
s
72
∘
Open in App
Solution
s
i
n
18
∘
c
o
s
72
∘
=
s
i
n
(
90
∘
−
72
∘
)
c
o
s
72
∘
As,
(
s
i
n
(
90
∘
)
−
A
)
=
c
o
s
A
So,
⇒
c
o
s
72
∘
c
o
s
72
∘
=
1
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Trigonometric Ratios of Complementary Angles
Standard X Mathematics
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