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OpenStudy (anonymous):
Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions sin(11π/8) = sin(13π/12)= cos(11π/8)= cos(π/8)= Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions sin(11π/8) = sin(13π/12)= cos(11π/8)= cos(π/8)= @Mathematics
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