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Converting all terms in tan form;
Let
,
and
.
now, converting all the terms:
We can write it in tan form as:
or
................(1)
We can write it in tan form as:
or
......................(2)
Similarly, for
;
we have
.............(3)
Using (1) and (2) we have L.H.S
On applying
We have,
=R.H.S.
Hence proved.