Verify the identity
The expression is an identity.
To demonstrate that the preceding statement is an identity, divide it into two portions, LHS and RHS. Separate the two and simplify them independently when you've completed separating. If the results are equal, the given statement is an identity.
Now, simplify LHS of :
Substituting 1 by ,
RHS of the equation is
Both RHS and LHS are equal. Hence it is an identity
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