Post a New Question

Trig

posted by .

Use the half angle formula to find the exact value of

tan 7 pie/8

  • Trig -

    tan(7pi/8) = tan(7pi/4/2)

    hence
    tan(7pi/8)=sin(7pi/4)/(1+cos(7pi/4))

    sin(7pi/4)=-(root2)/2
    cos(7pi/4)=(root2)/2

    so
    tan(7pi/8)= -(root2)/2/(1+(root2)/2)

    and then tidy up.

    Sorry about the expressions, not easy to do in text.

  • Trig -

    How do you tidy it up?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    um take home test...i have no idea what im doing always sometimes never 1. sin2x=2sinx 2. cos (pie/3+x)=-sinx 3. if tan x=3 and tan y=2 then tan (x+y)=5 4. when you use the half angle formulas you choose whether to use a + or - by …
  2. precal

    use the half angle formula to determine the exact values of sin, cos, and tan of the angle. pie/8 and pie/12
  3. trig

    Use a half-angle formula to find the exact value of cos 5ð/12
  4. trig

    please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°
  5. trig

    please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°
  6. Trigonometry

    use the appropriate trig identity (sum and difference, half angle, double angle) to find the exact value. 1)cos 255 degrees 2) sin 165 degrees 3) tan 285 degrees
  7. trig

    use a half angle formula to find the exact value of cos 75 degree
  8. Trig

    Find the exact value of tan 5pi/12 using the half-angle identity.
  9. Trig

    How do i find the exact value of sin 15 using the half angle formula
  10. trig

    use a half-angle identity to find the exact value of tan 105 degrees.

More Similar Questions

Post a New Question