For instance if I were to create a cast on target spell:
Shock 7 points 7 seconds (in 10 ft)
Fire 7 points 7 seconds (in 10 ft)
Frost 7 points 7 seconds (in 10 feet)
Would I be able to reduce the spell cost by going:
Shock 7 points 7 seconds (in 10 ft)
Fire 7 points 7 seconds
Frost 7 points 7 seconds
With Shock being the dominant effect in this particular spell, as long as the Shock component has the AoE, do I actually need an AoE for the fire and frost to take effect?