Two sides of a right triangle abc (c is the right angle) are given. find the indicated trigonometric function of the given angle. give exact answers with rational denominators.

find cot a when b = 6 and c = 7.

can someone work this out step by step?

Here, suppose, c is the length in opposite site to angle C. Same pattern for other two!!
So, we have: Base = 6
Perpendicular = ?
Hypotenuse = 7 

Now, calculate base by applying Pythagoras theorem, 
H² = P² + B²
7² = 6² + P²
P² = 49 - 36
P = √13

Now, we know cot A = B/P = 6/√13

In short, Your Answer would be 6/√13

Hope this helps!