化简计算cos(80°+3α)cos(35°+α)+sin(80°+α)cos(55°-α)的过程?

化简计算cos(80°+3α)cos(35°+α)+sin(80°+α)cos(55°-α)的过程?
没有打错，是3α
^.^
sunny6723 1年前 已收到1个回答 举报
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cos(80°+α)cos(35°+α)+sin(80°+α)cos(55°-α)
=cos(80°+α)cos(35°+α)+sin(80°+α)sin(35°+α)
=cos[(80°+α)-(35°+α)]
=cos55°
cos(80°+3α)?

1年前

3
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