+0  
 
0
51
1
avatar

z = 10(cos30°+ i sin30°)

w = 5(cos10°+ i sin 10°)

 

what is zw?

 May 28, 2020
 #1
avatar+21556 
0

To multiply to numbers in  r·cis(theta) form, multiply the r-values, and add the angles.

 

The formula is:  r1·cis(A1) x r2·cis(A2)  =  r1·r2·cis(A1 + A2)

 

10(cos30o + i sin30o)  can be written as  10·cis(30o)

5(cos10o + i sin10o)  can be written as  5·cis(10o)

 

Can you use the formula to get your answer?

 May 28, 2020

33 Online Users

avatar