approximate cosine and sine | Desmos

Expression 3: "T" left parenthesis, "x" , "a" , right parenthesis equals left brace, StartFraction, pi Over 2 , EndFraction less than mod left parenthesis, "x" , 2 pi , right parenthesis less than StartFraction, 3 pi Over 2 , EndFraction : negative "P" left parenthesis, mod left parenthesis, "x" , 2 pi , right parenthesis minus pi , "a" , right parenthesis , StartFraction, pi Over 2 , EndFraction less than mod left parenthesis, "x" plus pi , 2 pi , right parenthesis less than StartFraction, 3 pi Over 2 , EndFraction : "P" left parenthesis, mod left parenthesis, "x" plus pi , 2 pi , right parenthesis minus pi , "a" , right parenthesis , right brace

3

Expression 4: "y" equals "T" left parenthesis, "x" , 0 , right parenthesis

4

Expression 5: "y" equals "T" left parenthesis, "x" , 1 , right parenthesis

5

6

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