Has anyone else noticed this? For the topic 'differentiating trigonometric functions' the paper copy is very different from the digital(page 248)... even the examples aren't all the same? Anyone know why this is? I read somewhere that edexcel recently removed differentiating the inverse of sin,cos,tan. Could this be the reason- since edexcel have control of the digital copy but not over the one you already bought. Also, does this mean differentiating the inverse of these trig functions won't be on this year's test?