Need help A level math question (picture attached below)

Question

anonymous · Answer

attachment

amistre64 · Answer

divide and inverse tan maybe?

anonymous · Answer

what do you mean?

amistre64 · Answer

i typed what i meant ... divide, then take the inverse

amistre64 · Answer

im assuming since your asking the question that you are taking the class and that you are familiar with these terms ...

anonymous · Answer

yea sorry i know what they mean, so after dividing can you help with the inverse.

phi · Answer

I think amistre is saying  sin(2x)/cos(2x) = tan(2x)
so you solve
tan(2x) = 2
do you have to do this *without* a calculator?

anonymous · Answer

okay thanks that helps and we are allowed a calculator

phi · Answer

the tricky part is because you have tan(2x)
you have to find all the angles A from 0 to 2 pi  where tan(A)= 2
(because after you divide by 2) the answers will be between 0 and pi

anonymous · Answer

phi could u help me pl

amistre64 · Answer

the sites borken, notifs aint notifying as they should ... but phi did well :)