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JEE Mains · Maths · STD 12 - 7.2 definite integral

ગણ \(S=\{x: x \in[0,100]\) અને \(\left.\int_0^x t^2 \sin (x-t) d t=x^2\right\}\) ના ઘટકોની સંખ્યા ___ છે.

  1. A 15
  2. B 16
  3. C 31
  4. D 32
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Answer & Solution

Correct Answer

(B) 16

Step-by-step Solution

Detailed explanation

\(\int_0^x t^2 \sin (x-t) d t=x^2\) Use by parts \(-x^2 \operatorname{cox}+x^2+2 x^2 \cos x-2 x \sin x\) \(-x^2 \operatorname{cox}+2 x \sin x+2 \cos x-2=x\) \(\cos x=1\) \(x=0,2 \pi, 4 \pi, \ldots \ldots, 30 \pi\) Total Elements = 16
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