Prove that:

To Prove: ![]()
Formula Used: ![]()
Proof:
LHS
… (1)
Let ![]()

Therefore
… (2)
From the figure, ![]()
… (3)
From (2) and (3),
![]()
Substituting in (1), we get
LHS ![]()



![]()
![]()
![]()
= RHS
Therefore, LHS = RHS
Hence proved.
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