GlaxoSmithKline PLC (LON:GSK) is definitely a company with fundamentals. That said, investors cannot buy at any price. Investors need to learn how to interpret GlaxoSmithKline's market triggers. This analysis shows some key indicators that can tell you when to buy and when to sell. The GlaxoSmithKline moving averages show a cyclical pattern characterized by extended bullish timeliness and a short-lived bearish trend. This implies that GlaxoSmithKline maintains an overall bullish trend. Therefore, the way to…