Expression 13: "f" Subscript, "x" , Baseline left parenthesis, "t" , "u" , right parenthesis equals "l" cosine left parenthesis, "u" , right parenthesis sine left parenthesis, "t" , right parenthesis left brace, negative pi less than "t" less than pi , right bracefxt,u=lcosusint−π<t<π
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Expression 14: "f" Subscript, "y" , Baseline left parenthesis, "t" , "u" , right parenthesis equals "l" sine left parenthesis, "u" , right parenthesis sine left parenthesis, "t" , right parenthesis left brace, 0 less than "u" less than pi , right bracefyt,u=lsinusint0<u<π
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Expression 15: "f" Subscript, "z" , Baseline left parenthesis, "t" , "u" , right parenthesis equals "l" cosine "t"fzt,u=lcost
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Expression 16: "l" equals 7.5l=7.5
negative 10−10
1010
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Expression 17:
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Expression 18: "F" Subscript, "x" , Baseline left parenthesis, "t" , "u" , right parenthesis equals left parenthesis, "R" plus "r" cos "t" , right parenthesis cosine left parenthesis, "u" , right parenthesis left brace, negative pi less than or equal to "u" less than or equal to pi , right braceFxt,u=R+rcostcosu−π≤u≤π
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Expression 19: "F" Subscript, "y" , Baseline left parenthesis, "t" , "u" , right parenthesis equals left parenthesis, "R" plus "r" cos "t" , right parenthesis sine left parenthesis, "u" , right parenthesis left brace, negative pi less than or equal to "t" less than or equal to pi , right braceFyt,u=R+rcostsinu−π≤t≤π
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Expression 20: "F" Subscript, "z" , Baseline left parenthesis, "t" , "u" , right parenthesis equals "r" left parenthesis, sin "t" , right parenthesisFzt,u=rsint