a). You're lacking some basic knowledge. Before you start solving differential equations you should know among other things that if y=cos x then dy/ dx = -sin x.
b) Separate the variables.
1. Solve the following DE’s, by inspection.
(a) y’= -sin x
2.Verify that the given function is a solution to the DE. Then determine c that satisfies the conditions given.
(a) xy’ = y ; y = cx; y=pie when x = 2
I have no clue how to start these 2 questions,,, Help please!