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JEE Mains · Maths · STD 12 - 7.2 definite integral

\(\sum_{r=1}^{20}\left(\left|\sqrt{\pi\left(\int_0^r x|\sin \pi x| d x\right)}\right|\right)=\) ___ .

  1. A 200
  2. B 210
  3. C 190
  4. D 220
Verified Solution

Answer & Solution

Correct Answer

(B) 210

Step-by-step Solution

Detailed explanation

Let \(I_r=\int_0^r x|\sin \pi x| d x\) ...(1) Apply King Property \(=\int_0^{\mathrm{r}}(\mathrm{r}-\mathrm{x})|\sin \pi \mathrm{x}| \mathrm{dx}\) ... (2) By (1) + (2) \(2 I_r=\int_0^r r|\sin \pi x| d x \Rightarrow I_r=\frac{r}{2} \int_0^r|\sin \pi x| d x\)…
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