To convert a complex number in "cis" form to standard form, you need to use the following relationship:

cis(theta) = cos(theta) + i sin(theta)

where "theta" is the angle in radians, "cos(theta)" is the real part of the complex number, and "i sin(theta)" is the imaginary part.

So, if you have a complex number written in the form "r cis(theta)", you can convert it to standard form by multiplying each part by the corresponding trigonometric function:

r cis(theta) = r cos(theta) + r i sin(theta) = r cos(theta) + i r sin(theta) = real + imaginary i

where "real" is the real part of the complex number, and "imaginary" is the imaginary part.

For example, if you have the complex number 4 cis(80), you can convert it to standard form as follows:

4 cis(80) = 4 cos(80) + 4 i sin(80) = 113.8 + 645.4 i

This is the standard form representation of the complex number.

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