Answer We note that every trig integral can be expressed by rational function.
1. | The integral of a sum is the sum of the integrals.
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2. | The integral of a constant multiple is a constant times the integrals.
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3. | Integration By Substitution.
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4. | Integration By Parts.
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5. | Partial Fraction Expansion.
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6. | Basic Integration Formula.
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Put
. Then
implies
.Then the interval of integration chages.
Thus,
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