**Problem : **
Use
*α* = 30^{
o
}
and
*β* = 45^{
o
}
to find the sine, cosine, and
tangent of
75^{
o
}
.

**Problem : **
Use
*α* = 135^{
o
}
and
*β* = 30^{
o
}
to find the sine, cosine, and
tangent of
105^{
o
}
.

**Problem : **
Express the following as a function of a single angle:
sin(20^{
o
})sin(30^{
o
}) + cos(20^{
o
})cos(30^{
o
})
.

**Problem : **
Express the following as a function of a single angle:
.

**Problem : **
Express the following as a function of a single angle:
sin(340^{
o
})cos(120^{
o
}) + cos(340^{
o
})sin(120^{
o
})
.