Posted by **John** on Tuesday, June 28, 2011 at 1:51pm.

Trigonometric Substitution

a. Explain why the substitution x = asin(Theta) guarantees that cos(Theta) is greater than or equal to 0 .

b. What sort of restriction must we put on x and a so that the substitution x = asec(Theta)will guarantee that tan(Theta) is greater than or equal to 0?

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