HP15C HP42S integration of trig differs in *rad and *deg

[brickviking]

Okay, I've read the above posts, I even understand them—sort of. But I'm a little stuck, and I'll show what I mean (cursor movements are like this).

I entered it like this: EQW INTEGRAL 0 Right PI / 2 Right SIN X Right X Up Up (to highlight the whole equation). Then I hit EVAL and I got PI^2/8 for a result. ->NUM converted that to about 1.2337

I tried doing the same in DEGREES mode:
EQW INTEGRAL 0 [/i]Right[/i] 90 Right SIN X Right X Up Up

When I hit EVAL, it wanted me to switch to Radians mode, and wouldn't eval the sin function otherwise.

My Top line reads DEG XYZ HEX R= 'X'

So, where do I go from here? Have I forgotten something? Apologies for all the hodgepodge sentences, I haven't finished my helmet of tea yet.

(Post 209)