Question

In the abbreviation of the trigonometric form of a complex number, , what does the c represent? 

	A.	cosine
	B.	cosecant
	C.	coordinate
	D.	complex

In the abbreviation of the trigonometric form of a complex number, , what does the s represent? 

	A.	secant
	B.	sine
	C.	square root
	D.	sum

When converting a complex number, z, into trigonometric form , what is r? 

	A.
	B.
	C.
	D.

 

Answer 1

1)

The complex number

z = r cis θ

c represents cosine

Option A is correct.

Answer 2

2)

The complex number

z = rcis θ

s represents sine.

Option B is correct.

Answer 3

3)

The complex number

z = r(cos θ + i sin θ)

r represents magnitude of the complex number (|z|).

Option D is correct.