Вычислите: cos3π/8*sin19π/8 - sin3π/8*sin7π/8
=cos3n/8*sin(2n-3n/8)-sin3n/8*sin(n/2+3n/8)=cos3n/8*sin3n/8-sin3n/8*cos3n/8=0
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=cos3n/8*sin(2n-3n/8)-sin3n/8*sin(n/2+3n/8)=cos3n/8*sin3n/8-sin3n/8*cos3n/8=0