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(Solved): Let y=3tanx (a) Find the differential dy=3sec^(2)xdx. (b) Evaluate dy and \Delta y when x=(\pi )/(4) ...



Let

y=3tanx

(a) Find the differential

dy=3sec^(2)xdx

. (b) Evaluate

dy

and

\Delta y

when

x=(\pi )/(4)

and

dx=-0.2

dy=-1.2 and \Delta y=?
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