1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jek_recluse [69]
3 years ago
13

Find the product of z1 and z2, where z1 = 2(cos 70° + i sin 70°) and z2 = 4(cos 200° + i sin 200°)

Mathematics
2 answers:
Scilla [17]3 years ago
6 0

Answer: <u>-8i</u>

2(cos 70 + i sin 70) * 4(cos 200 +isin 200)

8 (cos (70+200) + i sin (70+200)     factor a i sin 70 out

8 (cos(270) + i sin (270))

cos 270 is (0,-1)   sin 270 is -1 from the unit circle

cos 270 is 0

8 (0 -i)

<u>-8i</u>

vazorg [7]3 years ago
5 0

Answer:

-8i

Step-by-step explanation:

To multiply numbers is polar form

z1 = r1 ( cos theta 1 + i sin theta 1)

z2 = r2 ( cos theta 2 + i sin theta 2)

z1*z2 = r1*r2 (cos (theta1+theta2) + i sin (theta1+theta2)

z1 = 2(cos 70° + i sin 70°)

z2 = 4(cos 200+ i sin 200)

z1z2 = 2*4 (cos (70+200) + i sin (70+200)

z1z2 = 8 (cos(270) + i sin (270))

       = 8 (0 + i (-1))

       =-8i

You might be interested in
A woman standing on a hill sees a flagpole that she knows is 40 ft tall. the angle of depression to the bottom of the pole is 14
NemiM [27]
Let distance form the pole = x  and height of the hill = y ft

now we can set up 2 equayions 
tan 18 = (40-y)/x
tan 14 = y/x

from second equation y = sxtan14  so we have:-
 tan 18  = ( 40 - x tan 14) /  x

x tan 18 = 40 - x tan 14
x(tan 18 + tan 14) = 40

x   = 40 / (tan18 + tan 14)  =  69.66 feet Answer



6 0
3 years ago
Question Is In The Picture
Alexxandr [17]

Answer:

30

Step-by-step explanation:

Pythagorean theorem states that a^2 + b^2 = c^2

this theorem only works on triangles with an angle of 90 degrees or a right triangle.

18^2 + 24^2 = 900

the square root of 900 is 30

I did the square root of 900 because the square root is the 'opposite' of squaring which is what you need to do in order to find 'c' is the Pythagorean theorem. 'a' is 18, and 'b' is 24

Answer is 30

5 0
2 years ago
What is 74/10 = ? ?/?
larisa86 [58]

Answer:

7.4

Step-by-step explanation:

Gud luck on the rest of your school work :)

7 0
3 years ago
Read 2 more answers
Factorize: a^2+10ab -75b^2
soldier1979 [14.2K]

Answer:

9

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Wich is greater 8kg or 30 oz
Anna11 [10]
8kg, Because 8kg in oz is 282
5 0
3 years ago
Read 2 more answers
Other questions:
  • !!!! HELPPP NOWWW PLSSS ITS DUE IN 1 HOUR !!!!!!
    10·2 answers
  • Solve: (1/2) X - (1/3) Y = Z
    14·1 answer
  • Hot air balloons generally descend at a rate of 200 to 400 feet per minute. Four balloons descend 200 feet per minute for 9 minu
    11·1 answer
  • What is <br>the circumference of a circle with radius 3.5cm. Take [Pi=22/7]​
    8·2 answers
  • F(x) = (x + 1)2<br><br> I need helpppp! <br> Someone helppp
    13·1 answer
  • If h(x)=x2-5+7. <br>h(2)<br><img src="https://tex.z-dn.net/?f=x2" id="TexFormula1" title="x2" alt="x2" align="absmiddle" class="
    14·1 answer
  • What is the simplest form of the expression below?
    15·2 answers
  • Find the missing height of a rectangular prism that has a volume of 137.5 inches with a width of 2.5 and length 10 in
    12·1 answer
  • A car is traveling at a speed of 81 kilometers per hour. What is the car's speed in meters per second? How many meters will the
    13·1 answer
  • Determine if each of the following functions from {a,b, c,d} to itself is one-to-one and/or onto. Check ALL correct answers. (a)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!