sin5π/2+cos720°-cos7π+cos3π/2
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sin5π/2+cos720°-cos7π+cos3π/2sin5π/2+cos720°-cos7π+cos3π/2sin5π/2+cos720°-cos7π+cos3π/2原式=sinπ/2+cos
sin5π/2+cos720°-cos7π+cos3π/2
sin5π/2+cos720°-cos7π+cos3π/2
sin5π/2+cos720°-cos7π+cos3π/2
原式=sinπ/2+cos0度-cosπ+cosπ/2
=1+1-(-1)+0
=3
sin5π/2+cos720°-cos7π+cos3π/2
=1+1+1+0=3