Thursday

August 21, 2014

August 21, 2014

Posted by **trig** on Monday, November 12, 2012 at 5:16pm.

- trig -
**Steve**, Monday, November 12, 2012 at 5:26pmHmmm. Sensing a missing ^ character, we have

tan^2(A) - 2tanA + 1 = 0

(tanA - 1)^2 = 0

tanA = 1

So, A = 45º or 225º

- trig -
**Reiny**, Monday, November 12, 2012 at 5:52pmor taking it at face value the way it was typed

tan 2A - 2tan A = -1

2tanA/(1-tan^2 A) - 2tanA = -1

let tanA = x for easier typing

2x/(1-x^2) - 2x = -1

times 1 - x^2

2x - 2x + 2x^3 = -1 + x^2

2x^3 - x^2 + 1 = 0

by Wolfram

http://www.wolframalpha.com/input/?i=2x%5E3+-+x%5E2%2B1%3D0

x = -.657298

tanA = -.657298

A = 146.7° or A = 326.7°

both work

- trig -
**Anonymous**, Wednesday, November 14, 2012 at 3:56pma ladder leaning against a vertical wall make an angle 24 degrees with the wall.the foot of the ladder is 5 ft from the wall find the length of the ladder

- trig -
**jr**, Monday, April 7, 2014 at 7:41pmYou lean a ladder 6.7 m long against a wall. It makes an angle of 63 degrees with the level ground. How high up is the top of the ladder?

**Related Questions**

algebra 1 help please - 4) a student score is 83 and 91 on her first two quizzes...

Algebra 2 - Solve. 4a-2≤a+1≤3a+4 4a-2-1≤a+1-1≤3a+4-1 4a-...

trig - Find all angles, 0≤A<360, that satisfy the equation below, to ...

Trig - Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270...

trig - Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270...

Pre Calculus - sec x = -2 , π ≤ x ≤ 3π Use a calculator to...

calculus - In spherical coordinates, the inequalities 0≤ρ≤2, 3...

Math/Trigonometry - 1. Solve: 2 cos² x - 3 cos x + 1 = 0 for 0 ≤ x < ...

Probability - Random variables X and Y are distributed according to the joint ...

probability - Random variables X and Y are distributed according to the joint ...