A question from a recent Praxis II exam states which has more roots between 100π and 1000π?

a. cos(x)

b. cos(x)^2

c. cos(√(x))

thanks for your help

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- Feb 24th 2009, 06:03 PMtigerpawroots between 100π and 1000π Praxis II
A question from a recent Praxis II exam states which has more roots between 100π and 1000π?

a. cos(x)

b. cos(x)^2

c. cos(√(x))

thanks for your help - Feb 24th 2009, 06:46 PMwytiaz
If cos(x)^2 means cos(x^2) then it will win, it has an absurdly large number of roots in that domain compared to the other two.

If cos(x)^2 means (cos(x))^2 then it will be a tie with cos(x)

The one with the root has very few roots in the domain compared to the other two.