Answer:y=
Acosx+Bsinx +cosx ln(cosx)+x sinx
Step-by-step explanation:
given equation y''+y=secx
auxiliary equation

so CF is y=Acosx+Bsinx
now

using wronskian formula

=
now f(x)=secx




now particular integrals are
PI=cosx ln(cosx)+x sinx
total solution
y= C.F+P.I
y=Acosx+Bsinx +cosx ln(cosx)+x sinx
B. 81 square units
Area for a square is length times width. In this case, both are 9 so 9 x 9 = 81
Answer:
0.0002
Step-by-step explanation:
I think its "Yes it can because -3.5 lies to the left of -1.5"