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## TransendentialPI 3 years ago This exercise is in a section about using trig substitution to integrate. I can use trig sub, but I'm just not seeing what initial substitution to use so I can apply trig sub. Can anyone give me a hint? I don't need (don't want) it solve to the end. At least not yet. Delete Cancel Submit

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1. TransendentialPI
• 3 years ago
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See attached

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2. mukushla
• 3 years ago
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3. TransendentialPI
• 3 years ago
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The trick is, how do we get this integral into the form$dx \over \sqrt{u^2 +a^2}$

4. TransendentialPI
• 3 years ago
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sorry du on top

5. violy
• 3 years ago
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note, 16+x^6= (4)^2+(x^3)^2. or (x^3)^2+(4)^2.

6. violy
• 3 years ago
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what will be the a ? and what will be the u?

7. violy
• 3 years ago
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then, get the derivative of u.

8. TransendentialPI
• 3 years ago
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Thanks, that is just what I needed.

9. violy
• 3 years ago
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most welcome:))

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