As you may see, I am struggling at this.
Show that, for triangle RST, t = r sin (alpha + beta) / sin alpha
iv tried using the sine rule,
t / sin(180 - alpha - beta) = r / sin alpha
t = r / sin alpha x sin(180 - alpha - beta)
After that, i get confused because usually i would expand the sin bracket. ie:
sin(45+45) = sin 45 cos 45 + cos 45 sin 45
but in this case, i have 180, alpha, and beta in one bracket.......
Am i even taking the right steps?