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التكامل بالأجزاء: Mathematics Tawjihi question with answer

A Tawjihi Mathematics question (التكامل) with the answer and worked steps.

From the Tawjihi question bank: Mathematics · التكامل

أجب عن الأجزاء الآتية للتكامل xsinxdx\int x\sin x\,dx: أ. اختر uu وdvdv. ب. طبق قاعدة الأجزاء. ج. تحقق بالاشتقاق السريع.

التكامل بالأجزاء

The answer

أ. u=x,dv=sinxdxu=x, dv=\sin xdx، إذن du=dx,v=cosxdu=dx, v=-\cos x. ب. التكامل xcosx(cosx)dx=xcosx+sinx+C-x\cos x-\int(-\cos x)dx=-x\cos x+\sin x+C. ج. مشتقة الجواب cosx+xsinx+cosx=xsinx-\cos x+x\sin x+\cos x=x\sin x.

Explanation

يقيس الإشارة في v=cosxv=-\cos x والتحقق بالاشتقاق.

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