Consider the following theorem. Theorem If fis integrable on [a, b], then [Aw) dx - f(x) dx = lim i = 1 where Ax = b-a and x, = a + iAx. n Use the given theorem to evaluate the definite integral.

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Q: Tutorial Exercise If fis integrable on [a, b], the following equation is correct. [" f(x) dr = limf…

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A: given y=f(x)=tan-1(x)        dydx=ddx(tan-1x)dydx=1x2+1 y=f(x)=tan-1x⇒x=tan(y)dxdy=ddy(tany)=sec2y

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Q: Evaluate the definite integral: (2 – a²)dx using limit of the Riemann sum.

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Riemann Sum

Riemann Sums is a special type of approximation of the area under a curve by dividing it into multiple simple shapes like rectangles or trapezoids and is used in integrals when finite sums are involved. Figuring out the area of a curve is complex hence this method makes it simple. Usually, we take the help of different integration methods for this purpose. This is one of the major parts of integral calculus. 

Riemann Integral

Bernhard Riemann's integral was the first systematic description of the integral of a function on an interval in the branch of mathematics known as real analysis.