=-sina*sina+cosa(-cosa)
=-1
化简sin(兀+a)cos(3/2兀+a)+sin(兀/2+a)cos(兀+a)=
化简sin(兀+a)cos(3/2兀+a)+sin(兀/2+a)cos(兀+a)=
数学人气:194 ℃时间:2020-04-01 23:46:06
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