Friday, April 25, 2014

Evaluate the definite integral between the x limits 0, 1 if the function is given by y=max(1/4,x^2).

We notice that if x = 1/2, then there is no maximum, the 2
given functions having the same value.


Therefore, we'll
evaluate the definite integral over 2 ranges.


If x belongs
to the interval [0,1/2], then 1/4 > x^2.


If x
belongs to the interval [1/2,1], then x^2 > 1/4.


The
definite integral of the given function is calculated over the identified
ranges.


I = Int dx/4 (0->1/2) + Int x^2dx
(1/2->1)


We'll apply Leibniz Newton formula to
determine the definite integrals:


Int dx/4 = F(1/2) -
F(0)


Int dx/4 = x/4


F(1/2) =
1/8 and  F(0) = 0


F(1/2) - F(0) = 1/8
(*)


Int x^2dx = F(1) -
F(1/2)


Int x^2dx = x^3/3


F(1)
= 1/3


F(1/2) = 1/24


F(1) -
F(1/2) = 1/3 - 1/24


F(1) - F(1/2) =
(8-1)/24


F(1) - F(1/2) = 7/24
(**)


We'll add (*) and (**) to find out
I:


I = 1/8 + 7/24


I =
(3+7)/24


I = 10/24


I =
5/12


The requested definite integral of the
given function is I = 5/12.

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