Sinusoidal steady-State proplem

hi everyone

I have a hard time to figure out these proplems in the picture.

Here are my solutions:

1) V1 = V*R/(R+ L) (voltage divider)
but we have V = cos(wt)
=> V1 = cos(wt)*R/(R+L)

2) L* di/dt + R*I = V1*cos( w*t + )
==> V1 = (L*di/dt + R*I)/cos(w*t +)

3) ?

4) V2 = R/(R +C)

5)?

6)?

7) ?

 

Here is the picture

you can also check this link for the pciture if this doesn't work

For the picture click here