化简:(1)根三sinx+cosx (2)sinx-cosx (3)3sinx+4cosx (4)根二sin(π/4-x
2个回答
1)2sin(x+π/6)
2)根号2sin(x-π/4)
3)5sin(x+arccos3/5)
4)1/2(cosx-sinx)
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