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Trigonometric Substitution

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Use trigonometric substitution to write the algebraic expression sqrt(36-4x2) as a trigonometric function, where the substitution is x = 3 cos theta and 0<theta<pi/2.


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A Trigonometric Substitution is empolyed to write an algebraic expression. The solution is detailed and well presented. The solution was given a rating of "5" by the student who originally posted the question.