Calc
posted by Jordan .
Whats the derivative of 2x^2*tan(X)/sec(x) ?

simplify it first
y = 2x^2 tanx / secx
= 2x^2 sinx/cosx * cosx
= 2x^2 sinx
then by product rule
dy/dx = (2x^2)cosx + 4x sinx
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