50-period SMA and 200-period EMA Cross

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Explanation of the Code:
SMA and EMA Calculation:

The sma50 variable is calculated using the ta.sma function for a 50-period simple moving average.
The ema200 variable is calculated using the ta.ema function for a 200-period exponential moving average.
Plotting:

The SMA is plotted in blue using the plot function.
The EMA is plotted in orange using the plot function.
Crossover and Crossunder Detection:

The script uses ta.crossover and ta.crossunder to detect when the 50-period SMA crosses above or below the 200-period EMA.
Alert Conditions:

alertcondition is used to create conditions for setting alerts. Alerts will trigger whenever the 50-period SMA crosses above or below the 200-period EMA.
Buy/Sell Labels:

plotshape is used to display labels on the chart whenever the SMA crosses the EMA. A green "BUY" label appears when the SMA crosses above the EMA, and a red "SELL" label appears when the SMA crosses below the EMA.