Hello can someone please help me with those question

Find the exact value of the expression. 1 tan arccos = I] 1 2 tan [arccos [E] ] (Type an exact answer, using radicals as needed Verify that the equation is an identity. 3 - COS X sin 2 X = 1 2 Choose the correct answer below. O A. 3 - COS X - sin 2 X 3 - COS X sin x 1+ cos x + sin x = = 1 2 2 2 1 + cos x 1+ cos x O B. 3 - COS X 3 - COS X 2 tan x 1 - tan x + 2 tan x - sin 2 X =1 2 2 2 1 - tan x 1 - tan x O C. 3- COS X 3 - COS X 1 - cos X sin x + 1 - cos x - sin = 1 NE 2 2 sin x sin x O D. 3 - COS X 2 X 3- COS X 1 - cos x 3- cosx -1+ cos x - sin = 1 2 2 2 2 2Solve the equation for exact solutions over the interval [0, 21:). 9tan3x=9 Select the correct choice below and, if necessary, ll in the answer box to complete your choice. '3' A- The solution set is { }. (Type an exact answer, using 1: as needed. Type your answer in radians. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) '32:} B. The solution is the empty set. Determine the remaining sides and angles of the triangle ABC. A=120.66, C =21.37, c = 150 B=|:| am|:| (Do not round until the final answer. Then round to the nearest tenth as needed.) bmlj (Do not round until the final answer. Then round to the nearest tenth as needed.)