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OCR: Using Mathematical Functions 613 11.3 kept in a The angle is obtained by applying the arctangent to the expression This IS his usually illustrated in Figure 11-3 to search tomatically he program point to of a point x,y 3= arctan Figure 11-3 are In stored the structure in program of structures. the Cartesian coordinates declared and before the the polar function coordinates of Both main( the of so structures members point that They are the declaration will be visible throughout the program. names are composed two members of type doubl but the reflect the different coordinates. are sqrt doub The le and () mathematical functions from the library used takes in return this parameter value causes program an of error type type radius pow and atan2 ( The sart function ited in Fig returns the squar ...