trig

posted by .

tan200(cot10-tan10)

  • trig -

    keystrokes I used on my SHARP scientific calculator

    I assume your units are degrees, so make sure your calc is set to DEG


    tan 10
    -
    tan 10 =
    x
    ta200
    =

    you should get 2

  • trig -

    sorry about the double-post

    proof of above:

    tan200(cot10-tan10)
    = tan20(1/tan10 - tan10) , 9since by CAST tan200 = tan200)
    = tan20( 1 - tan^2 10)/tan10
    = 2tan10/(1 - tan^2 10) * ( 1 - tan^2 10)/tan10
    = 2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. trig

    prove that :tan20 tan30 tan40 =tan10
  2. campridge trigonometry

    prove that ; tan20 . tan30 . tan40 = tan10
  3. Pre-Calculus

    I need help on these problems they are from my study guide and i don't have a clue on how to do these 3 problems and if anyone can show the steps and somewhat explain the steps so i can do it myself next time. 1.) sin25‹cos35‹sin‹35 …
  4. precalc

    Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1, where your theta is in degrees. B. The Trig form of z1*z2, where z2=5[cos(60degrees)+isin(60degrees)] C. The Trig Form of (z1)^4
  5. trig

    tan200(cot10-tan10)
  6. maths

    Tan100+4sin100=? As tan(90+10)+4sin(90+10) -cot10+4cos10 Aftr that i don't know what to do
  7. Math

    prove: tan10+tan70+tan100=tan10.tan70.tan100
  8. calculus

    1. what trig function has an amplitue of 1 and negative values for angles between π/2 and π?
  9. Trigonometry

    how do i evaluate this? 1+tan 200(degrees) tan 80(degrees)/tan200(degrees)-tan 80(degrees)
  10. Math

    Solve without the use of a calculator: sin20(tan10+cot10) I know it should equal two but I don't know how to get there

More Similar Questions