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Perform the indicated operation. Give answers in rectangular form expressing real and
imaginary parts to four decimal places. 50) (12 cis 14.5 degree)(3 cis 8.5 degree)
Solution
12cis14.5 /3cis8.5
write numerator and denomiantor in polar form
12cis14.5 = 12e^i(14.5)
3cis8.5 = 3e^i(8.5)
12cis14.5 /3cis8.5 = 12e^i(14.5)/ 3e^i(8.5)
= 4e^i6
= 4(cos6 +isin6)
= 3.9780 + i*0.4181

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