sinπ/3+cosπ/2=（根号3)/2 +0=（根号3)/2
5sin90°+2sin0°-3sin270°+10cos180°
=5*1+2*0-3*(-1)+10*(-1)
=5+3-10
=-2
sinπ/3+cosπ/2=5sin90°+2sin0°-3sin270°+10cos180°=
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