Answer:
A. -4 + 6i
Step-by-step explanation:
Cause as we can see... (-2 - 2i)+(10-4i)
We get when we multiply 2x2=4i
Next 10-4=6
Hope it helped u
Answer:
tanΘ = - 
Step-by-step explanation:
Using the trigonometric identities
• sin²x + cos²x = 1, hence
cosx = ± √(1 - sin²x )
• tanx = 
given sinΘ =
, then
cosΘ = ± 
Since Θ is in the second quadrant where cosΘ < 0, then
cosΘ = - 
= -
= - 
tanΘ = 
=
× -
= - 