8. \( \int x a^{2} d x=a^{x}\left[\frac{x}{\ln a}-\frac{1}{\ln ^{2} a}\right]+C \). 9. \( \int x^{n} \ln x d x=\frac{x^{n+1}}{n+1}\left(\ln x-\frac{1}{n+1}\right)+C \). 10. \( \int \operatorname{arcsen} x d x=x \operatorname{arcsen} x+\sqrt{1-x^{2}}+C \). 11. \( \int \operatorname{arctg} x d x=x \operatorname{arctg} x-1 / 2 \ln \left(1+x^{2}\right)+C \). 12. \( \int \operatorname{arcctg} y d y=y \operatorname{arcctg} y+1 / 2 \ln \left(1+y^{2}\right)+C \). 13. \( \int \arccos 2 x d x=x \arccos 2 x-1 / 2 \sqrt{1-4 x^{2}}+C \). 14. \( \int \operatorname{arcsec} y d y=y \operatorname{arcsec} y-\ln \left(y+\sqrt{y^{2}-1}\right)+C \). 15. \( \int \operatorname{arccsc} \frac{t}{2} d t=t \operatorname{arccsc} \frac{t}{2}+2 \ln \left(t+\sqrt{t^{2}-4}\right)+C \).
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Beyond the Answer
Did you know that the concept of integration dates back to ancient civilizations? The ancient Greeks, particularly Archimedes, used methods similar to integral calculus to find areas and volumes. His work laid the groundwork for the fundamental theorem of calculus, which connects differentiation and integration—a key component in discovering the mysterious relationships within mathematics! Feeling overwhelmed with these integrals? You're not alone! A common mistake is forgetting the constant of integration, C, which is crucial for indefinite integrals. Another tip is to always double-check your derivatives after integrating; it's a great way to confirm your calculations are on the right track. Keep practicing, and you'll master those integrals!
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