How do you triple 3 1/2[mixed number]

If the value of cos330°is√3/2 then find cos 165°.

Harry and jay are both flying on the same plane with an airline that randomly assigns seats to passengers. of the 182 total seats on the plane, 62 are window seats, 58 are middle seats, and the rest are aisle seats. what is the approximate probability that both harry and jay will be assigned aisle seats on the same plane? a. 11.48% b. 3.3% c. 2.08% d. 26.26%

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)