touch_app Tap inner function

Find the function whose derivative is also in the integral. This will be our 'u'.

drag_pan Drag to substitute

Replace the pieces of the integral with your new variables.

tune Adjust to integrate

Apply the power rule: increase the power by 1 and divide by the new power.

touch_long Hold to revert

Substitution Complete!

Our original problem was in terms of x. Press and hold 'u' to substitute back.

You successfully reversed the chain rule.