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★高一年级北京师大二附中 (10 0 0 88) 汪燕铭一、选择题1.ｓｉｎ15°·ｓｉｎ3 0°·ｓｉｎ75°的值等于 ( ) .(Ａ) 34 (Ｂ) 38 (Ｃ) 18 (Ｄ) 142 .ｃｏｓ2 75° +ｃｏｓ2 15° +ｃｏｓ75°·ｃｏｓ15°的值等于 ( ) .(Ａ) 62 (Ｂ) 32 (Ｃ) 54 (Ｄ)
★ Grade one of Beijing Normal University Second Affiliated Middle School (10 0 0 88) Wang Yanming 1. The value of multiple choice questions 1.sin15°·sin3 0°·sin75° is equal to () (A) 34 (B) 38 (C) 18 ( D) 142 .cos2 75° +cos2 15° +cos75°·cos15° is equal to () .(A) 62 (B) 32 (C) 54 (D)