1. sin7x*sin4x+cos4x*cos7x-cos11x
2. sin7x*cos4x+sin4x*cos7x-3sin11x
3. sin 2п/5 *cos п/15-cos 2п/5*sin п/15
2. sin7x*cos4x+sin4x*cos7x-3sin11x
3. sin 2п/5 *cos п/15-cos 2п/5*sin п/15
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