# Math

How do you know what the period of this function is: y=2cos3(x+45')? Explain.

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1. y = 2cos(3x+135)

cos(kx) has period 2pi/k, so y has period 2pi/3.

The 135 is just a phase shift, and does not affect the period.

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posted by Steve
2. Ok thanks a lot for your help steve :D

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posted by Han

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