问题
填空题
计算：
|
答案
∵cos15°+sin15° cos15°-sin15°
=(sin15°+cos15°)2 (cos15°-sin15°)(cos15°+sin15°)
=1+2sin15°cos15° cos215°-sin215°
=1+sin30° cos30°
=1+ 1 2 3 2
=
．3
故答案为：
．3
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计算：
|
∵cos15°+sin15° cos15°-sin15°
=(sin15°+cos15°)2 (cos15°-sin15°)(cos15°+sin15°)
=1+2sin15°cos15° cos215°-sin215°
=1+sin30° cos30°
=1+ 1 2 3 2
=
．3
故答案为：
．3