Question

1)

Find all exact solutions on the interval (0, 2). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE. 2 cos(2x) + 2 = 0 X

2)

Answer 1

Quel ecos (22) + JE=0 soly acos (2x) -J2 cos (2x) = -2 2 staking inverse of cosine of both sides. er = cos() &x= 30 4 X 3 8 cosine is negative in It I in II t I quardant 2x = 200 - 300 ។ x = 5T 2 391 8 toring Sort T i SUT x=135 8 1391 9 Casa = COL2= 6 x= = I 2 Period of cos (24) is a T. Bo the solution is .: n= integers But lenye 8 Au 3:03<37 Que a Case Body cos oc) [2003)-1)=0 COS X-10 Cosa = 1/2 Period of Cosul X = Cos is 20 & N= 301 casine is positive in I b Il quardant =&r-I ST So the sololation is I, OI, 31,5 F: 0<x< PM] x= I 3 3 x=59 1x= I 2 ST