O0o.im proud of myself for being able to figure out e trigo ratios..spent quite a time sia..i skipped e significant fig n e sector/sement thigy..cos i forgot is too fast or too difficult for me.cos everything learned dis yr all forget le...ahhhh..if anyone can help me do them,i can do e trigo thingy in exchange..sighs.i think i will drag dis for a long time bah..hope to haf at least 2 wks hw-free.so must finifh in e next wk.good luck to everyone out dere. 加油!!