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**1. Homework Statement**

Find when this is "0" for the first time:

[tex] q(t) = e^{-20t} (5cos(40t) + \frac{5} {2} sin(40t)) [/tex]

**2. Homework Equations**

**3. The Attempt at a Solution**

[tex] 0 = e^{-20t} (5cos(40t) + \frac{5} {2}sin(40t)) [/tex]

[tex] 0 = (5cos(40t) + \frac{5} {2}sin(40t)) [/tex]

[tex] cos(40t) = -\frac{1} {2}sin(40t)) [/tex]

Is the best way to solve this perform interations?

Thanks

Sparky

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