Based on the Edexcel syllabus.
In this powerpoint it says that the differential identities for trig functions such as tan(x), cosec(x), sec(x) and cot(x) are NOT given in the formula booklet, but they in fact ARE PROVIDED. That being said, it is correct to say it is handy to learn them.
Great resource, but the first example on slide 4 is incorrect, missing a power of 3 (chain rule)
Proof on slide 6 isn't working
When I click on "Click for proof" it doesn't seem to work - it simply goes on to next slide