Evaluate the following products without multiplying directly:
(i)
(ii)
(iii)
Solution (i)
Here, we can use an identity:
(1)
In this problem, we have
,
and
.
So, putting values in (1), we get
Solution (ii)
Here, we can use an identity:
(1)
In this problem, we have
and
and
.
So, putting values in (1), we get
Solution (iii)
Here, we can use an identity:
(1)
We have
and
Putting values in (1), we get
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