For me, I like a girl who is simple the way she is, smart and God Fearing.. ^_^

When 1 pair of side of a quadrilateral is parallel.

Well, mathematics is very important in real life because all you've learned during your school days can apply in different ways, such like how to budget in a daily needs and etc.
Without mathematics, living in this precious world is useless.

**D (arc because X)**

**D = because^-1 X**

**= 1/because X**

**=[because X (0)- 1(-sin X)]/ (because X)^2**

**= sin X/ (because X) (because X)**

__= tan X / because X__