Question

MOHON BANTUANNYA. DENGAN CARANYA! HANYA 3 NOMOR. NO. 1, 4 dan 5

Answer 1

4. cos 1.020 = cos(2.360 + 300) = cos 300 = cos(360 - 60) = cos 60
5.
2 cos² x +3 cos x - 2 = 0
(2 cos x - 1)(cos x + 2) = 0
ambil 2 cos x - 1 = 0
2 cos x = 1
cos x =
x = 1, r = 2

tan x =