题目内容
化简:
.
| sin(π-α)sin(3π-α)+sin(-α-π)sin(α-2π) |
| sin(4π-α)sin(5π+α) |
| 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.
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