Can anyone me with these two problems? you.

which follows from the difference-of-squares identity, , with and .

which is due to the Pythagorean identity.

by the distributive property; .

by definition of cotangent, .

due to the Pythagorean identity.

by factorization of the numerator as a difference of squares.

by cancellation of (provided ).

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

the answer is c 13. hope you got this down : d