求导数。
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(2) y'=1/2√x+1/x·√x
(4)f'(x)=3cosx+2/x
(6)y'=5x⁴+ln5·5^x
(8)y'=2xsinx+x²cosx
(10)f'(x)=3x²lnx+x³/x=3x²lnx+x²
(12)y'=(-cosx+xsinx)/cos²x+(cos²x+sin²x)/cos²x=(1-cosx+xsinx)/cos²x
(14)y'=(1-lnx)/x²
(16)u'=[cosx·(1+cosx)+sin²x]/(1+cosx)²=(cosx+1)/(1+cosx)²
(18)s'=[cost(1+cost)+(1+sint)sint]/(1+cost)²=(cost+sint+1)/(1+cost)²
(20)y'=2e^x·cosx-2e^x·sinx=(2cosx-2sinx)e^x
(4)f'(x)=3cosx+2/x
(6)y'=5x⁴+ln5·5^x
(8)y'=2xsinx+x²cosx
(10)f'(x)=3x²lnx+x³/x=3x²lnx+x²
(12)y'=(-cosx+xsinx)/cos²x+(cos²x+sin²x)/cos²x=(1-cosx+xsinx)/cos²x
(14)y'=(1-lnx)/x²
(16)u'=[cosx·(1+cosx)+sin²x]/(1+cosx)²=(cosx+1)/(1+cosx)²
(18)s'=[cost(1+cost)+(1+sint)sint]/(1+cost)²=(cost+sint+1)/(1+cost)²
(20)y'=2e^x·cosx-2e^x·sinx=(2cosx-2sinx)e^x
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