See attached file for full problem description

See attached file for full problem description.
1) Find the canonic equation of the straight (recta) in the space( espacio), with R

2) Calculate the scaling product of the vectors r y s knowing that r = 3i + 4j; that the module of the vector / s/ = 6; and the angle that both vectors form is 120°

3)Find the following limits

a) =

b) =

4) Find the value of the derivative of y = , so x = 4

5) Three gears whose ratios are 17, 16 and 15 cm. are supported by a triangular base that has as its vertex the centre of each gear. What is the measure of those interior angles of the triangle?

See attached file for full problem description.