Find the exact value of the other five trigonometric functions of theta:

(a) sin theta=5/13,and cos theta>0

(b)cos theta=-4/5,and sin theta >0

(c)tan theta=15/8,and sec<0

(d)cot theta=-5/12,and csc theta<0

(e)csc theta=-2,and cot theta>0

How to do this questions because i don't understand what i am supposed to do ....