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^.^
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![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^.^](/uploads/image/z/10407197-29-7.jpg?t=%E5%8C%96%E7%AE%80%E8%AE%A1%E7%AE%97cos%2880%C2%B0%2B3%CE%B1%29cos%2835%C2%B0%2B%CE%B1%29%2Bsin%2880%C2%B0%2B%CE%B1%29cos%2855%C2%B0-%CE%B1%29%E7%9A%84%E8%BF%87%E7%A8%8B%3F%E6%B2%A1%E6%9C%89%E6%89%93%E9%94%99%EF%BC%8C%E6%98%AF3%CE%B1%5E.%5E)
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^.^
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
^.^
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^.^
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)?
化简计算 cos(80+3a)cos(35+a)+sin(80+a)cos(55-a)..
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^.^
简计算cos(80+3a)*cos(35+a)+sin(80+a)*cos(55-a)
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