+sin π 12 )(cos π 12 -sin π 12 )= ; (2)cos200°cos80°+cos110°cos10°= ; (3)tan10°tan20°+tan20°tan60°+tan60°tan10°= ; (4)cos π 7 cos 2π 7 cos 3 7 π= ; (5)sin20°sin40°sin80°= ; (6)cos20°+cos100°+cos140°= ...
计算:(1)(sin 320°-sin 220°-tan 400°)(tan 320°+cos 40°+cos 140°); (2)2^(log _4(1-lg 3)^2)+lg 30.相关知识点: 试题来源: 解析 (1)seinapmocc{\歌高吭引\lef3S2eF^{语自言自c}流细惜声无眼泉应反核高树一成妆玉碧)-\sepmiugft(柳翠鸣鹂黄个两sereah0^换物移星rF4H...