1.

Tan45+tan20/1-tan45tan20=tan65

Answer» \bold{Answer :}

We know that,

TAN (A + B) = (TANA + tanB)/(1 - tanA tanB)

Now,

L.H.S.

= (tan45 + tan20)/(1 - tan45 tan20)

= tan (45 + 20)

= TAN65

= R.H.S.

Hence, proved.

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