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Byju's Answer
Standard X
Mathematics
Trigonometric Identities
ii Evaluate: ...
Question
Question 3 (ii)
Evaluate:
(ii)
s
i
n
25
∘
c
o
s
65
∘
+
c
o
s
25
∘
s
i
n
65
∘
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Solution
(ii)
s
i
n
25
∘
c
o
s
65
∘
+
c
o
s
25
∘
s
i
n
65
∘
=
s
i
n
(
90
∘
−
65
∘
)
c
o
s
65
∘
+
c
o
s
(
90
∘
−
65
∘
)
s
i
n
65
∘
=
c
o
s
65
∘
c
o
s
65
∘
+
s
i
n
65
∘
s
i
n
65
∘
=
c
o
s
2
65
∘
+
s
i
n
2
65
∘
=
1
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Similar questions
Q.
Question 3 (ii)
Evaluate:
(ii)
s
i
n
25
∘
c
o
s
65
∘
+
c
o
s
25
∘
s
i
n
65
∘
Q.
s
i
n
25
∘
c
o
s
65
+
c
o
s
25
∘
s
i
n
65
Q.
Evaluate:
sin
25
∘
cos
65
∘
+
cos
25
∘
sin
65
∘
Q.
Evaluate
(
i
)
sin
2
63
∘
+
sin
2
27
∘
cos
2
17
∘
+
cos
2
73
∘
(
i
i
)
sin
25
∘
cos
65
∘
+
cos
25
∘
sin
65
∘
Q.
Evaluate:
(i)
sin
2
63
∘
+
sin
2
27
∘
cos
2
17
∘
+
cos
2
73
∘
(ii)
sin
25
∘
cos
65
∘
+
cos
25
∘
sin
65
∘
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