Question

What is exp(ja) equal to, where j is the square root of unity?

a) cos ja + jsin a
b) sin a + jcos a
c) cos j + a sin j
d) cos a + jsin a

Answer 1

The expression exp(ja) is equal to cos(a) + jsin(a), so the correct answer is d) cos(a) + jsin(a).

So, the correct answer is: a) cos ja + jsin a

Step-by-step explanation:

The expression exp(ja) is equal to cos(a) + jsin(a), so the correct answer is d) cos(a) + jsin(a). In this expression, j represents the imaginary unit, which is the square root of unity and has the property that j^2 = -1.

The expression exp(ja) is equal to cos(a) + jsin(a), so the correct answer is d) cos(a) + jsin(a).

The function exp(x) represents the exponential function.

So, the correct answer is:

a) cos(a)+jsin(a)