5.3+(day+1)+due+10-26

2. secx-2=0 secx=2 a) sec(pi/3)=2 b) sec(5pi/3)=2 2=2 2=2 pi/3 and 5pi/3 are both good solutions

4. 4cos^2(2r) - 2 = 0 4cos^2(2r)=2 cos^2(2r)= 1/2 cos2r= sq root 2/2 a) cos2pi/8=sq root 2/2 b) cos2(7pi/8)=sq root 2/2 cospi/4=sq root 2/2 cos7pi/4=sq root 2/2 sq root 2/2=sq root 2/2 sq root 2/2=sq root 2/2 pi/8 and 7pi/8 are both good solutions

2 & 4 Done by Cameron Johnson I got the same thing, Cameron you're like really really smart. Will Duffy


 * 1) 6&8.

Done by Matthew Milan i got the same answers Peter Radecki Done by: Clarissa Rodriguez I agree with Clarissa. I got the same answers for both. Checked by Kelsey harmon

By Daniel Leeper I got for 14. x = 0,pi/2,3pi/2 for 16. x = pi/6, pi/3, 2pi/3, 5pi/6, 7pi/6, 4pi/3, 5pi/3, 11pi/6 I'm not entirely sure though. Checked by Jan Dudek

18. 2sinx +1=0 2sinx= -1 sinx= -1/2 = 7pi/6 or 11pi/6

20. tan^2x-1=0 tan^2x=1 tanx=1 =pi/4 or 5pi/4 18&20 done by: Alyssa Sturgis

I solved the problems the same way, and reached the same answers! Checked by: Abby Demiano

3tan^3x=tanx 3tan^2x=1 tan^2x=1/3 tan x=sqrt3/3 x= pi/6 & 7pi/6
 * 21

2Sin^2x=2+cosx 2(1-co^2x)=2+cosx 2-2cos^2x=2+cosx 0=cosx=2cos^2x 0=cosx(1+2cosx) (Two seperare equations equalling zero) cosx=0 x=pi/2 and 3pi/2 & 1+2cosx=0 2cosx=-1 cosx=-1/2 x=2pi/3 and 4pi/3
 * 22


 * 1) 21 and 22 done by Miles Hennington

I got the same answers! Good job! Checked by: Jennifer Hassell


 * 1) 25 and #26 done by Amy Finkelstein[[image:SCANNNNNNNNNNNNN.jpg width="800" height="385" caption="#25 and #26 done by Amy Finkelstein"]]

I got the same thing! checked by: Alyssa Johnson

27.

Done by Joon Baek 28.



Done by Joon Baek Looks good -Michael Herzberg

sec^2x+tanx = 3 tan^2x+1+tanx = 3 tan^2x+tanx-2 = 0 (tanx-1)(tanx+2) = 0 tanx-1 = 0 tanx+2 = 0 tanx = 1 tanx = -2 x = pi/4, 5pi/4 x = 2.0334, 5.1760
 * 1) 29-

2cos^2x+cosx-1 = 0 (2cosx-1)(cosx+1) = 0 2cosx-1 = 0 cosx+1 = 0 2cosx = 1 cosx = -1 cosx = 1/2 x= 5pi/3, pi/3 x = pi i worked and checked problems 39 and 30 since they weren't put up.kristen hanslik
 * 30-


 * 1) 40 Done by Matt Bogaert

x = pi/12 + pi/2 x = 5pi/12 + pi/2


 * 42

pi/3 + xpi 2pi/3 + xpi