Results 1 to 2 of 2

Math Help - Trig/Proving Identities

  1. #1
    nick09
    Guest

    Trig/Proving Identities

    I'm completely stumped. were supposed to prove the equations true. if you could help me that would be great!


    3.) sec^2(θ)-sec^2(θ)sin^2(θ)=1

    4.) sec^2(θ)cot^2(θ)-1=cot^2(θ)

    5.) 1/sec(θ)-cos(θ)=cot(θ)csc(θ)

    6.) sec^2(θ)+csc^2(θ)=csc^2(θ)sec^2(θ)

    7.) [1/sin(θ)+1] - [1/sin(θ)-1]=2sec^2(θ)

    8.) [sin(θ)tan(θ]/[1-cos(θ)]=sec(θ)=1
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    #1: It often helps to rewrite it in terms to sine and cosine.

    sec^{2}(x)-sec^{2}(x)sin^{2}(x)

    =\frac{1}{cos^{2}(x)}-\frac{sin^{2}(x)}{cos^{2}(x)}

    =\frac{1-sin^{2}(x)}{cos^{2}(x)}

    =\frac{cos^{2}(x)}{cos^{2}(x)}=1
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Proving Trig identities help!
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: March 28th 2011, 05:33 AM
  2. Proving Trig Identities
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: April 23rd 2009, 05:13 PM
  3. Proving Trig Identities
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: February 25th 2009, 10:56 AM
  4. Proving Trig Identities?
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: January 7th 2009, 09:24 AM
  5. HELP! Trig-Proving Identities
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: April 22nd 2006, 09:48 AM

Search Tags


/mathhelpforum @mathhelpforum