计算: sin65°+sin15°sin10° sin25°-cos15°cos80°
计算:sin65°+sin15°sin10°sin25°-cos15°cos80°....
计算: sin65°+sin15°sin10° sin25°-cos15°cos80° .
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推荐于2016-11-30
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sin65°+sin15°sin10° | sin25°-cos15°cos80° | = cos(10°+15°)+sin15°sin10° | sin(15°+10°)-cos15°sin10° | = cos10°cos15° | sin15°cos10° | = = cos(45°-30°) | sin(45°-30°) | = = =2+ . |
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