Question

Hii guys plz tell me
Tan225°× cot405°+ tan765°×cot675°

Answer 1

the answer is
and to determine cot in the calculator put 1÷cos=cot
√6 + 2√2

Answer 2

$\sf \: L.H.S= tan 225° cot 405° + tan 765° cot 675° \\ \\ \sf \: = tan ( 180° + 45° ) cot( 360° + 45° ) + tan( 2.360° a 45°) cot ( 2.360° - 45°) \\ \\ \sf = \: tan45° cot45° + tan45° cot ( -45°) \\ \\ \sf \: = 1.1 + 1.(-1) \\ \\ = \sf1 - 1 \\ \\ \sf = 0 \\ \\ \sf \: = R.H.S \\ \\ \: \: \bf \: hence \: proved$