sin10°+cos70° sin80°+cos20° 的值是______
sin10°+cos70°sin80°+cos20°的值是______....
sin10°+cos70° sin80°+cos20° 的值是______.
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萌神03ZD53
推荐于2016-10-29
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解 sin10°+cos70° | sin80°+cos20° | = sin10°+sin20° | cos10°+cos20° | = 2sin15°cos5° | 2cos15°cos5° | =tan15° =tan = = 2- 故答案为: 2- |
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