What is the derivative of ##1+tan^2x##?
What is the derivative of ##1+tan^2x##?
2tanxsec^2x
differentiate using the##color(blue)(” chain rule “) ##
rewrite ## tan^2x = (tanx)^2##
d/dx[ 1 + (tanx)^2] = 2(tanx) d/dx(tanx)
= 2tanxsec^2x
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