is proved
Solution:
We have to prove that,
By the trignometric identity,
Divide both the sides by
in above identity,
--- eqn 1
We know that by definition of tan,
Therefore,
Apply the above in eqn 1
---- eqn 2
By definition of cosine,
Therefore,
Apply the above in eqn 2
On rewriting we get,
Thus the given identity is proved step by step