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Hey thanx.if this way confuses you ,
find dy/dx =0
you will get x values ,
plug this x values in the second derivative .. and they must be positive which shows its minimum
it you draw the graph , it will be parabola , and its least value ( vertex) will be ABOVE x -axis , which shows its positive and cant be negative
Hmm don't know abt it. Dyu have ny idea what this formula is?Thanks , i completely got it ..
but i think there is a formula for trapezium rule which is much faster and saves time .. if you can do it that way