4)Find the general solution of the following differentialequation.
y''+4y=tan(x) -pi
5)A mass of 100 grams stretches a spring 98 cm in equilibrium. Adashpot attached to the spring supplies a damping force of 600dynes for each cm/sec of speed. The mass is initially displaced 10cm above the equilibrium point before the mass is attached, andgiven a downward velocity of 1 m/sec. Find its displacement fort>0.
