问题
解答题
化简:
|
答案
sin(π-α)sin(3π-α)+sin(-α-π)sin(α-2π) sin(4π-α)sin(5π+α)
=sinα•sinα+sinα•sinα -sinα•(-sinα)
=2.
化简:
|
sin(π-α)sin(3π-α)+sin(-α-π)sin(α-2π) sin(4π-α)sin(5π+α)
=sinα•sinα+sinα•sinα -sinα•(-sinα)
=2.