**Problem : **
Calculate
sin(*θ*), cos(*θ*)
, and
tan(*θ*)
if
sin(2*θ*) = 2 sin(30^{
o
})cos(30^{
o
})
.

**Problem : **
Calculate
cos(15^{
o
})
using the fact that
cos(30^{
o
}) =
.

**Problem : **
*θ*
is in the first quadrant, and
tan(*θ*) =
. Find the
sine, cosine,
and tangent of
2*θ*
.

**Problem : **
*θ*
is in the third quadrant, and
sin(*θ*) = -
. Find the
sine, cosine,
and tangent of
(*θ*)
.