We begin by investigating whether the lengths are the same. find the length of the vector, c, starting with the components given in equations 3 and 4.express your answer in terms of a, b, and θ.equation 3: \evec{c}_x = a + b\cos(\theta) andequation 4: \evec{c}_y = b\sin(\theta).c = somehow do not understand how to get the problem right on mastering engineering. i square each equation, add them, and use the pythagorean theorem.