Question

cos theta=2/9, tan theta <0 find sin theta

Answer 1

If tan x<0 and cos >0 then quadrant IV, so sin is negative.

Answer 2

==> sin theat =-sqrt(77) /9

Answer 3

find the other side using pythagoras, then all the ratios are there that you need. just make sure your signs are right. ala mandolino

Answer 4

using phytaorean therom