化简cos(3/2π+π)sin(-π+α)

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化简cos(3/2π+π)sin(-π+α)
化简cos(3/2π+π)
sin(-π+α)

化简cos(3/2π+π)sin(-π+α)
cos(3/2π+π)=cos(π/2+2π)=cosπ/2=0

=cos(π/2)=0