Avaldis 4: left parenthesis, cos left parenthesis, "a" , right parenthesis , sin left parenthesis, "a" , right parenthesis , right parenthesiscosa,sina
4
Avaldis 5: "l" equals cosine left parenthesis, "a" , right parenthesis squared plus left parenthesis, sin left parenthesis, "a" , right parenthesis minus 1 , right parenthesis squaredl=cosa2+sina−12
5
Avaldis 6: left parenthesis, "x" minus cos left parenthesis, "a" , right parenthesis , right parenthesis squared plus left parenthesis, "y" minus sin left parenthesis, "a" , right parenthesis , right parenthesis squared equals "l"x−cosa2+y−sina2=l
