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For questions 13 - 15, let z, - 2 cos( # |+ /sing ) | and zz - B[cos (20 )+ sin( ()). Calculate the

For questions 13 - 15, let z, - 2 cos( # |+ /sing ) | and zz - B[cos (20 )+ sin( (")). Calculate the following, keeping your answer in polar form. (2 points each) 13. ZIZZ 14. 72 15

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