Find the phasor corresponding to the following signals:

i(t)= -8 Sin (10t +70°)

The solution is 8 <160 but I don't know the intermediate steps

Thanks

 

It looks like the reference for your phasors is cos(ωt), so get i(t) in the form of

i(t) = Io·cos(ωt + φ)

where Io≥0 and -180°<φ≤180°.

 

I don't have understood the intermediate steps please detail.... thanks

 

You need to show YOUR best effort to work YOUR homework.

If I give you

i(t) = Io·cos(ωt)

and I want you to express that in terms of sin(ωt), what would it be?

 

Is there a textbook you can read?