PreCalculus (PLEASE HELP, IM BEGGING!)

posted by .

Can anyone please explain these problems to me?? I really need help!I need to simplify these trig expressions but I don't understand how my teacher is doing it at all and I have a quiz on this tomorrow! I've really been trying but I just don't get it!

1)Mulitply:
[cosx/(1-cosx)][1+sinx/(1+sinx)]

2)Rewrite over common denominator:
[1/(1-cosx)]+[1/(1+cosx)]

3)Establish the identity:
[(1-cot^2x)/(1+cot^2x)]+1=2sin^2x

  • PreCalculus (PLEASE HELP, IM BEGGING!) -

    cos/(1-cos) * ((1+sin)+sin)/(1+sin)

    cos(1+2sin)/((1-cos)(1+sin))
    Not sure how to make it any simpler. No chance of a typo in the problem?

    ----------------------------

    ((1+cos) + (1-cos))/(1-cos)(1+cos)

    2/sin^2

    ----------------------

    (1-cos^2/sin^2)/(1+cos^2/sin^2) + 1

    (sin^2 - cos^2)/sin^2) / ((sin^2+cos^2)/sin^2) + 1

    (sin^2-cos^2)/(sin^2+cos^2) + 1

    (sin^2 - cos^2) + 1
    sin^2 + 1-cos^2
    sin^2+sin^2
    2sin^2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. CHEMISTRY

    PLEASE HELP I REALLY DO NOT UNDERSTAND THIS YOU DON'T REALLY HAVE TO ANSWER THE QUESTIONS BUT AT LEAST JSUT A LITTLE HINT THATS ALL PLEASE AND I HAVE A QUIZ ON THIS TOMORROW MY TEACHER REALLY CANNOT TEACH 1) what flaws exsit in Dalton's …
  2. Math

    I need some help please. I don't understand the math that we are doing. Please explains to me in detail how to do radical expressions and like how to simplify them and stuff. I don't get it and it would be much appreciated. here is …
  3. Algebra 1

    I need some help please. I don't understand the math that we are doing. Please explains to me in detail how to do radical expressions and like how to simplify them and stuff. I don't get it and it would be much appreciated
  4. Calc- Derivatives

    So, I have a bunch of derivative problems for homework and the only resource I have is the textbook, since we don't have notes. I have just started and want to make sure I'm doing them correctly. Our teacher said we do not have to …
  5. Algebra-I really need help, please?

    I have to solve sqrt(2x-7) >=5 answers would be x>=16 x>=7/2 7/2<=x<=16 x<=16 I don't get this concept at all and I have 20 of these kinds of problems for homeowrk-can someone direct me how to start or give me an …
  6. AlgebraII

    I really stuck on binomial theorem and I have a whole worksheet due Monday How do I solve (x+5y)^4 I need to really understand this-please explain the steps so I can learn from it and then use it to do the other problems
  7. trig

    I'm confused with this concept: Okay, so I have this problem: cos2x( 2 cos+1)= 0 I understand I have to work the problems separately and I get cos x= 2 and cos x= 1/2 Now, what I don't understand is how this connects to pi, radians …
  8. algebra

    can someone please explain "converting to slope-intercept form" to me please?
  9. Science

    I REALLY REALLY NEED HELP SO 1.I need to do an essay asking you (me)to explain what is the difference between erosion,transport,and deposition?
  10. algebra

    For the quadratic function f(x) = - x^2 +2x + 6, find the vertex and the axis of symmetry, and graph the function. Again, I need help with this as these are practice examples for an upcoming quiz and I stink at this part of algebra …

More Similar Questions