2010-11-21
展开全部
1+2cos60°乘cos350°
=1+2cos60°乘cos(-10)°
=1+2cos60°乘cos10°
=[cos60°]^2+2cos60°乘cos10° +[cos10°]^2
=[cos60°+cos10°]^2
=1+2cos60°乘cos(-10)°
=1+2cos60°乘cos10°
=[cos60°]^2+2cos60°乘cos10° +[cos10°]^2
=[cos60°+cos10°]^2
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