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Evaluate
and hence find the value of
=
Now,
=
=
= 22.5
=
=
= 2.25
+
= 22.5 + 2.25
= 24.75
17
and hence find the value of 
=
= 22.5
= 2.25
+ 
and hence find the value of = = 22.5 = 2.25 +