Trigonometric sum-difference formula for absolute values

  • Thread starter xooberon
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sin|x + y| = ?
cos|x + y| = ?

Is there any formula for these?
 

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  • #2
CRGreathouse
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You can use the even/oddness of the functions to remove the abs bars or shift it to a constant outside, then apply the normal sum-difference formulas.
 

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