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Rewrite sin ( x- 7pi/4) in terms of sin and cos

Rewrite sin ( x- 7pi/4) in terms of sin and cos
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Rewrite sin ( x- 7pi/4) in terms of sin and cos

User Paralife
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You use the difference identity for sin(A-B)=sinAcosB-cosAsinB.
User Ibrahim Yildirim
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