Expression 2: "y" cosine 2 "a" minus "x" sine 2 "a" equals sine left parenthesis, "x" cos 2 "a" plus "y" sin 2 "a" , right parenthesisycos2a−xsin2a=sinxcos2a+ysin2a
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Expression 3: "y" cosine "b" minus "x" sine "b" equals sine left parenthesis, "x" cos "b" plus "y" sin "b" , right parenthesisycosb−xsinb=sinxcosb+ysinb
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Expression 4: "b" equals left bracket, StartFraction, 2 pi Over 53 , EndFraction , StartFraction, 4 pi Over 53 , EndFraction , ...2 pi , right bracketb=2π53,4π53,...2π