Identify u-sub

What should "u" equal in this integral?

• x
• (lnx)/x
• lnx
• sin(lnx)

What should be used for u in the integral?

• no u needed
• 4t²
• t³
• 1/4t²

What is u for the function given?

• 
• 
• 
• 

What method would you use here?

• antiderivative rules.

• u-substitution

• integration by parts

• Stare at the question... forever.

What method would you use here?

• antiderivatives
• u-substitution
• integration by parts
• slope fields

What method would you use here?

• antiderivatives
• u-substitution
• integration by parts
• slope fields

What should "du" equal in this integral? $\int\ \frac{\tan x\sec x}{\sec^{5\ }x}dx$  

•  $du=\tan x\sec x\ dx$ 

•  $du=\sec x\ dx$  

•  $du=\sec2x\ dx$  

•  $du=\tan x\ dx$  

What is the choice of u for the integral?

 $\int_{ }^{ }e^x\left(1+e^x\right)^{\frac{1}{2}}dx$  

•  $u=e^x$  
  

•  $u=1+e^x$  
  

•  $u=\frac{1}{2}\left(1+e^x\right)$  

•  $u=\frac{1}{2}e^x$