求导y=ln cos(2x+1)

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求导y=ln cos(2x+1)
求导y=ln cos(2x+1)

求导y=ln cos(2x+1)
y=ln cos(2x+1)
y'=[ln cos(2x+1)]'
=1/cos(2x+1)*[cos(2x+1)]'
=1/cos(2x+1)*[-sin(2x+1)]*(2x+1)'
=-2/cos(2x+1)*sin(2x+1)
=-2tan(2x+1)

2* -sin(2x+1)* 1/cos(2x+1)
= -2tan(2x+1)

y'=[ln cos(2x+1)]'
=1/cos(2x+1)*[cos(2x+1)]'
=1/cos(2x+1)*[-sin(2x+1)]*(2x+1)'
=-2/cos(2x+1)*sin(2x+1)
=-2tan(2x+1)

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