Q10. Solve the following DE (use any method) (6xy)dx + (4y² + 9x²)dy = 0 Q11. Find Fourier Series of the function f(x) = Cos x, -T

Q 10,Q11

Extracted text: Q10. Solve the following DE (use any method) (6xy)dx + (4y² + 9x²)dy = 0 Q11. Find Fourier Series of the function f(x) = Cos x, -T < x="">< i="" q12.="" solve="" the="" following="" de="" using="" laplace="" transform="" y"="" +="" 2y/="" +="" y="0," y(0)="-1," y'="" (0)="1" %3d="" q13.="" use="" variation="" of="" parameters="" to="" solve="" the="" de="" e2x="" y"="" –="" 4y="" q14.="" a="" thermometer="" is="" removed="" from="" a="" room="" where="" the="" temperaiure="" is="" 75°f="" and="" is="" taken="" outside,="" where="" the="" air="" temperature="" is="" 5°f.="" after="" one="" minute="" the="" thermometer="" reads="" 55°f.="" how="" long="" will="" it="" take="" for="" the="" thermometer="" to="" reach="">