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Integrate sec^6 (2z) tan^12 (2z) dz. I really need some help here? Find percentage change in frequency of sound emitted by a whistle on a steam train. it moves away an observer with the velocity of 108 km/h? Does reacting a metal oxide with a herbal medicine increase antimicrobial effects? Calculus challenge:
Do this if you can:
Integrate (3-7t)/(t^2+12t+40)^2 dt? Find the number of real numbers solutions of each equation
X^2+3x+11=0?

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