Jump to content

Trig Help


SacredCultivator

Recommended Posts

SacredCultivator

Dear Readers,

I have procrastinated my Trig HW and I did what I knew but there are a few problems that I am stumped on and the Book does not do a great job on explaining it... So I shall see if you guys/girls can help me out.

Directions: Solve each equation on the interval 0 is less than or equal to theta(Symbol) < 2Pie.

11. 2Sin(squared)Theta - 1 = 0

13. Sin(3Theta) = -1

17. Sec 3Theta/2 = -2

23. 4Sec(Theta) + 6 = -2

-I got this down to: Sec(Theta) = -2

25. 3(Root 2)Cos(Theta) + 2 = -1

-I got this down to: Cos(Theta) = -3/ 3(Root2)

27. Cos(2(Theta) - Pie/2) = -1

29. Tan((Theta)/2 + Pie/3) = 1

I am sorry to put this onto you to help but yeah I just do not understand these problems but I got all the others...

If you are able to provide assistance I would appreciate like a tutorial on it to help myself... Thank you in advance.

Link to comment
Share on other sites

  • Replies 3
  • Views 2.2k
  • Created
  • Last Reply
Dear Readers,

I have procrastinated my Trig HW and I did what I knew but there are a few problems that I am stumped on and the Book does not do a great job on explaining it... So I shall see if you guys/girls can help me out.

Directions: Solve each equation on the interval 0 is less than or equal to theta(Symbol) < 2Pie.

11. 2Sin(squared)Theta - 1 = 0

13. Sin(3Theta) = -1

17. Sec 3Theta/2 = -2

23. 4Sec(Theta) + 6 = -2

-I got this down to: Sec(Theta) = -2

25. 3(Root 2)Cos(Theta) + 2 = -1

-I got this down to: Cos(Theta) = -3/ 3(Root2)

27. Cos(2(Theta) - Pie/2) = -1

29. Tan((Theta)/2 + Pie/3) = 1

I am sorry to put this onto you to help but yeah I just do not understand these problems but I got all the others...

If you are able to provide assistance I would appreciate like a tutorial on it to help myself... Thank you in advance.

ummm......just looking at the header made my brain hurt.... brain exploded when i saw equation :( .....so some one tell when this place became the homework nanny
Link to comment
Share on other sites

  • Administrator

Too busy to answer them but will tell you a few things. You'll need to use some identities to solve some of them. (for example the sin^2x and and cos2x).

The sec one should be easy. Secx is 1/cosx. Which implies the cosx is -0.5. Then solve as per usual...

What method you using? CAST?

Link to comment
Share on other sites

SacredCultivator

Hmmm this place never turned into the Homework place because no one asks :rolleyes: lol so I did.

@Lite: Yeah I know it has to do with those identities and I applied the ones I know and the method, I am not sure what CAST is... So I am not even sure which method my Teacher is teaching =X

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...