100%, It works.

1. Death Cross: This is the combination of two moving averages. It is used when a shorter-time frame moving average crosses over a higher-time frame moving average, indicating a trend reversal in favour of the bears.
   
   While computing Death Cross, a 50-DMA is the shorter time frame MA and 200-DMA is the higher timeframe MA. Therefore, when the 50-DMA crosses down the 200-DMA, it is considered a sign of further weakness. Traders should keep a close watch on these stocks if the 50-DMA crosses down the 200-DMA. They should look to short-sell and/or exit, as these stocks can weaken further from current levels.
   
   This is BEARISH SIGN.
   
   You can also take MA 25 – MA 50 for mid term as the way I did here
   
   In this example, It already warned that TATA MOTORS will go down.

2. Golden Cross: This is the opposite of death cross. When the short-term moving average of a stock or index moves above the long-term moving average.

This pattern as a bullish indicator.

While computing Golden Cross too, a 50-DMA is the shorter time frame MA and 200-DMA is the higher timeframe MA. Therefore, when the 50-DMA crosses above the 200-DMA, it is considered a sign of further upside

Again, You can also take MA 25 – MA 50 for mid term as the way I did here

Ex- Ashok leyland started its jouney only when golden cross approved!

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Source: Equityboxx | Blog