急...求导y=2x乘以cos(2x+π/6)

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急...求导y=2x乘以cos(2x+π/6)急...求导y=2x乘以cos(2x+π/6)急...求导y=2x乘以cos(2x+π/6)y''=(2x)''cos(2x+π/6)+2x[cos(2x+π

急...求导y=2x乘以cos(2x+π/6)
急...求导y=2x乘以cos(2x+π/6)

急...求导y=2x乘以cos(2x+π/6)
y'=(2x)' cos(2x+π/6)+2x[cos(2x+π/6)]'
=2cos(2x+π/6) - 4xsin(2x+π/6)

y=2xcos(2x+π/6)
y'=2cos(2x+π/6)-2xsin(2x+π/6)*2
=2cos(2x+π/6)-4xsin(2x+π/6)