大一高数求解!!!
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z=[cos(x+y) ]^(siny)
fx'
= siny.[cos(x+y) ]^(siny -1) . [ -sin(x+y) ]
=-sin(x+y). siny .[cos(x+y) ]^(siny -1)
fx'( x,π/2)
=-sin(x+π/2). sin(π/2) .[cos(x+π/2) ]^[sin(π/2) -1]
=-cosx .(1) . (-sinx)^( 1-1)
=-cosx
fx'
= siny.[cos(x+y) ]^(siny -1) . [ -sin(x+y) ]
=-sin(x+y). siny .[cos(x+y) ]^(siny -1)
fx'( x,π/2)
=-sin(x+π/2). sin(π/2) .[cos(x+π/2) ]^[sin(π/2) -1]
=-cosx .(1) . (-sinx)^( 1-1)
=-cosx
追问
您好,可是答案是-sinx
您好 在吗
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