Don’t understand this question!! Watch
but dy/dx gives the gradient of tangent, not the gradient of the normal
the gradient of the normal is -1/m where m is the gradient of the tangent
© Copyright The Student Room 2017 all rights reserved
The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.
Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE