作业帮cos78°cos33°+sin78°sin33°=
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/30 23:54:22
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cos78°cos33°+sin78°sin33°=
cos78°cos33°+sin78°sin33°=
cos78°cos33°+sin78°sin33°=
cos78°cos33°+sin78°sin33°
=cos(78-33)°
=cos45°
=√2/2
cos78°cos33°+sin78°sin33°=
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sin6°sin42°sin66°sin78°的结果.
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