for part b i’m close to the form they want it in but i have theta cos sec^3 theta but i only need theta sec^2 theta but the mark scheme is so weird and confusing
for part b i’m close to the form they want it in but i have theta cos sec^3 theta but i only need theta sec^2 theta but the mark scheme is so weird and confusing it makes more sense when u see the question https://imgur.com/a/oLnHmnz
Cos theta = (sec theta)^-1 or 1/(sec theta) so -1 + 3 = 2 (indicies laws)
You were close 1/2 way down. 3 theta cos(theta) sec^3(theta) becomes ... (look at the answe) and 3 sin(theta) sec^3(theta) becomes (again look at the answer)
ohhhhhh yeahhhh i realised the sin bit becomes tan sec^2 i just hadn’t realised u literally do the sam thing for the cos part 🤦🏽*♀️🤦🏽*♀️