AQA June 2015 C3 Paper Q8

C3 Mathematics AQA June 2015
rearranging inverse trig equations eg cot, cosec to get sec
solving a sec squared trig equation

[humblenoob]

This really helped me out! I've had trouble memorising the trignonmetric identities but that method of just dividing by sin and cos squared is so much simpler.
I paused the video half way through and tried to work the rest out and got the right answer! :D I did it a little differently (inverting the Cot^2 to tan^2 then adding 1 to both sides) but whatever works I guess :P Thanks for making this!

[connorwinson]

Thank you so much for this series, I was so confident with Core 3 but this paper (and question specifically) completely shattered my confidence haha, resitting on wednesday and hoping this helped :)

[hah]

sorry this is late, but could anyone explain how to use the SolveN thing on the calculator? I have tried entering cos^2(2x-75)-(1/4) but it doesnt give the right answers at all. thanks