 x 3 We know this integral: But what about this integral:

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 x 3 We know this integral: But what about this integral: Playing around with the Substitution method would give us the answer but let’s try a different approach: Consider that 9 + x2 is the sum of two squares. Then if we made 9 and x two sides of a right triangle… …and we can safely say given this info that…

We know this integral: x But what about this integral:  3

But what about this integral: 3 x 

But what about this integral: x  3

Trigonometric Substitutions

#36 5 t  Half-Angle Formula

#36 5 t  Double-Angle Formula