is this really that easy?

I have a few questions on homework (GCSE level) and it all seems very easy.

1) sin 28 = is it really that simple that you type in sin 28 into the calulator? so in this case sin = 0.469?

2) 6/ tan 40 = yet again do you just type that into cal? 7.15 in this case?

3) when knowing sine, cosine or tangent, and the question asks to find the angle, is it simply sin/cos/tan -1 (E.g0.3) ? E.g sin-1(0.5) angle would = 30 in this exp?

Need help all seems extremly easy :S

TY