Vector or scalar

Find the specified vector or scalar.
1. u = <12, 3>, v = <-5, -3>; Find u + v.

2. u = <11, 4> and v = <7, -8>; Find u ∙ v.

Find the angle between the given vectors. Round to the nearest tenth of a degree.
3. u = <7, 2>, v = <8, -4>

Solve the equation on the interval [0˚, 360˚).
4. (tan x – 1) (cos x – 2) = 0

5. sin⁡(2x)-cos⁡(x)=-sin(2x)