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Byju's Answer
Standard XII
Mathematics
Factorization Method Form to Remove Indeterminate Form
Prove that:si...
Question
Prove that:
sin
2
72
°
-
sin
2
60
°
=
5
-
1
8
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Solution
LHS
=
sin
2
72
°
-
sin
2
60
°
=
sin
2
90
°
-
18
°
-
3
4
=
cos
2
18
°
-
3
4
∵
sin
90
°
-
θ
=
cosθ
=
10
+
2
5
4
2
-
3
4
∵
cos
18
°
=
10
+
2
5
4
=
10
+
2
5
16
-
3
4
=
10
+
2
5
-
12
16
=
2
5
-
2
16
=
5
-
1
8
=
RHS
Hence
proved
.
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Q.
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Q.
Evaluate each of the following
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