u-Substitution

What should be used for u in the integral?

• no u needed
• 4t²
• t³
• 1/4t²

What should be assigned to u in the integral?

• 2x²
• 4x
• 5x
• no u needed

What should be used for u in the integral?

• tanx
• tan⁴x
• no u needed
• tanx secx

• A
• B
• C
• D

• A
• B
• C
• D

∫ 2x cos(x²) dx

• sin(x²) + C

• 2 sin ( 2x ) + C

• (1/2) sin(x²) + C

• 4 cos(2x ) + C

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• 
• 
• 
• 

• 
• 
• 
• 

∫ 6 x (x² +1 )² dx

• ( x² + 1)³ + C
• 3 ( x² + 1)³ + C
• ( x² + 1)¹ + C
• 6 ( x² + 1)³ + C

Evaluate without a calculator. Show all steps on a sheet of paper.

• A

• B

• C

• D

• E