sin 330:

Use the trigonometric identity, sin(360-x) = - sin x

I can re-write 330 as 360 - 30

So, sin(360-30) = - sin 30 which is one of the basic ratios to find out.

tan 5pi/4 = tan (pi+ pi/4)

Use the identity: tan (pi+ x) = tan x

so, tan (pi+ pi/4) = tan pi/4.

That solves the problem.

Hope it helped,

MAX