What is the product of 3√2cis(π/12) and 2√5cis(4π/3) ?

___cis(___)

Did you mean instead of ?

If that's the case, then the answer is:

Step-by-step explanation:

As you may know:

So:

Now:

So:

Now, using the inverse cosine:

Therefore, the equivalent expression for the  product of 3√2cis(π/12) and 2√5cis(4π/3) is:

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,