After breakdown of trendline & breakdown of 42850 level you may see 42500 level. further fall may take Banknity to 41800 level. 41800 is strong support for Banknifty. 41500-41800 its a strong BUY Zone. If Banknifty is reversed from that level then Banknifty maybe show some new high. If it will break that buying zone (41800-41500) or break trendline then you may see some down level 41000, 40600 & 40300 level. In uptrend 43600-43800 its a strong resistance for a Banknifty.