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Sum Identities
Question | Answer |
---|---|
sinx + cosu | 2sin((x + y)/2)cos((x - y)/2) |
sinx - siny | 2cos((x + y)/2)sin((x - y)/2) |
cosx + cosy | 2cos((x + y)/2)cos((x - y)/2) |
cosx - cosy | -2sin((x + y)/2)sin((x - y)/2) |