URGENT

simplify by cross products

(sec+csc)/(1+tan) = csc/1

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

Sum is 17 and their difference is 3

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?