sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体
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sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体
sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.
是上面整体除下面整体
sin7°+cos15°sin8°/cos7°-sin15°sin8°求值.是上面整体除下面整体
sin7°=sin(15°-8°)=sin15°cos8°-cos15°sin8°
cos7°=cos(15°-8)=cos8°cos15°+sin8°sin15°
所以,问题就简单了,把上面写的那个带进去之后
得到sin15°cos8°/cos8°cos15°=tan15°