Thanks, I understand 1, 2 and 3 now. And with 2, because its 2 x 2 you dont times them together, only add the power like in algerbra? Thats where i went wrong... i done 4^3 instead of 2. Thanks for that too....
Anybody help with 4?
and also, need help with a fifth one.
5) Prove that tanX -...