expand question [x/y+y/z+z/x] ^2 class 9
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Answer:
We have, (
y
x
+
z
y
+
x
z
)
2
(a+b+c)
2
=a
2
+b
2
+c
2
+2ab+2bc+2ca
=(
y
x
)
2
+(
z
y
)
2
+(
x
z
)
2
+2.
y
x
.
z
y
+2.
z
y
.
x
z
+2.
x
z
.
y
x
=
y
2
x
2
+
z
2
y
2
+
x
2
z
2
+2
z
x
+2
x
y
+2
y
z
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