sin16°sin224°+cos16°sin46°的值
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![sin16°sin224°+cos16°sin46°的值](/uploads/image/z/13908474-18-4.jpg?t=sin16%C2%B0sin224%C2%B0%2Bcos16%C2%B0sin46%C2%B0%E7%9A%84%E5%80%BC)
sin16°sin224°+cos16°sin46°的值
sin16°sin224°+cos16°sin46°的值
sin16°sin224°+cos16°sin46°的值
sin16°sin224°+cos16°sin46°
=-sin16°sin44°+cos16°sin46°
=-sin16°cos46°+cos16°sin46°
=sin(46-16)
=sin30°
=1/2
sin16°sin224°+cos16°sin46
=sin16[sin(180+44)]+cos16cos44
=-sin16sin44+cos16cos44
=cos(44+16)
=cos60
=1/2