Math

Question 1

sin(a+-b) =

Answer 1

sin(a)cos(b) +- cos(a) sin(b)

Question 2

cos(a+-b) =

Answer 2

cos(a)cos(b) -+ sin(a) sin(b)

Question 3

When doing partial fraction of
1/(s^2 +4), you…

Answer 3

Don’t write in terms on complex terms. Instead:

(Ax + B) / (s^2 +4)

Question 4

What do you do with partial fraction of 1/(s-2)^3

Answer 4

A/(s-2) + B/(s-2)^2 + C/(s-2)^3