Enter the expression 2cos2(θ)−1, where θ is the lowercase greek letter theta.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle