Here I am trying to find the general solution to what is on top of the page. Have I done this correctly? Thanks if you can check this for me
where O, the opposite, is
where A, the adjacent, is
and H, the hypotenuse, is
I missed out the explanation on this (which I think is best shown when the triangle is actually drawn out) but will keep it in mind whenever I do this type of question in the future.
Otherwise, would you believe that my working is correct?