作业帮(10x+y)-(10y+x)怎么化简
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(10x+y)-(10y+x)怎么化简
(10x+y)-(10y+x)怎么化简
(10x+y)-(10y+x)怎么化简
(10x+y)-(10y+x)
=10x+y-10y-x
=9x-9y
Sin[(π/2)+α)]COS(3π-α)tan(π+α)}/COS[(π/2)-α]COS(-α-π)
=cosα(-cosα)tanα/[sinα(-cosπ)]
=cosαtanα/sinα
=cosα(sinα/cosα)/sinα
=1
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