化简:cos(15º-α)cos15º-sin(15º-α)sin(-15º)
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化简:cos(15º-α)cos15º-sin(15º-α)sin(-15º)
![化简:cos(15º-α)cos15º-sin(15º-α)sin(-15º)](/uploads/image/z/7586401-49-1.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9Acos%2815%26%23186%3B-%CE%B1%29cos15%26%23186%3B-sin%2815%26%23186%3B-%CE%B1%29sin%28-15%26%23186%3B%29)
cos(15º-α)cos15º-sin(15º-α)sin(-15º)
=cos(15º-α)cos15º+sin(15º-α)sin(15º)
=cos(15°-α-15°)
=cos(-α)
=cosα.
=cos(15º-α)cos15º+sin(15º-α)sin(15º)
=cos(15°-α-15°)
=cos(-α)
=cosα.
化简:cos(15º-α)cos15º-sin(15º-α)sin(-15º)
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