Sin 3п/2•cos п/2+cos3п/2•sin п/2

Question

Sin 3п/2•cos п/2+cos3п/2•sin п/2

Answer 1

Sin(2π-3π/2)×cosπ/2+cos(2π-3π/2)×sinπ/2=-sinπ/2×cosπ/2+cosπ/2×sinπ/2=
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