Solve the differential equation using the method of variation of parameters.Select the correct Answer 
Definitions:
Q7: If <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8680/.jpg" alt="If then
Q45: Use cylindrical coordinates to evaluate <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8680/.jpg"
Q46: Evaluate the surface integral where S is
Q50: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8680/.jpg" alt=" by implicit differentiation.
Q57: Evaluate <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8680/.jpg" alt="Evaluate and
Q58: Find <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8680/.jpg" alt="Find
Q63: Find equations for the tangent plane and
Q81: Find the second partial derivatives of the
Q124: Use spherical coordinates to find the moment
Q142: A circle's radius is increasing.Find the rate