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(Solved): help solving  If we knaw the values of the sine and cosine of \( x \) and \( y \), we can find ...



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If we knaw the values of the sine and cosine of \( x \) and \( y \), we can find the value of \( \cos (x+y) \) by using the F
If we knaw the values of the sine and cosine of \( x \) and \( y \), we can find the value of \( \cos (x+y) \) by using the Formula for Cosine. State the formula. \[ \cos (x+y)= \]


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