Question

if sin(u) = 2/3, cos (u) = -sqrt(5)/3 and tan (u) = -2/sqrt(5). what is u?

Answer 1

well you can always use the arcsin() function to get back to the angle (radians or degrees). We see that the tan here is useless since all it does is put together the sin and cos of the angle. Applying arcsin(2/3)=u, u is approx. 0.73 rad or 41.81 degrees. Since cos(u)=cos(-u), we can keep this angle

Answer 2

hmm it says that it's wrong @P0sitr0n