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OpenStudy (credmond):
Use the addition or subtraction formula to find the exact value of the expression. sin(225)
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OpenStudy (mathmate):
Hint: sin(225)=sin(180+45) use the sum formula sin(a+b)=sin(a)cos(b)+cos(a)sin(b). sin(180)=0 sin(45)=\( \frac{\sqrt{2}}{2} \)
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