Differentiate `tan2x+sec2x`

Explanation

`y=tan2x+sec2x`
`dy/dx=d/dx(tan2x)+d/dx(sec2x)`
`=sec^2 2x xxd/dx(2x)+sec2xcdot tan2x xxd/dx(2x)`
`=2sec^2 2x+2sec 2x cdot tan2x`