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## Main Question or Discussion Point

I've got a test tomorrow and I can't figure this one out:

r[tex]^{2}[/tex] = 9cos(5[tex]\vartheta[/tex])

I picked the inteval from 0 to [tex]\pi[/tex]/2 and I keep getting 18/5 but the back of the book says the answer is 18. I think something is wrong with my interval. Help Please!

r[tex]^{2}[/tex] = 9cos(5[tex]\vartheta[/tex])

I picked the inteval from 0 to [tex]\pi[/tex]/2 and I keep getting 18/5 but the back of the book says the answer is 18. I think something is wrong with my interval. Help Please!