Tuesday
October 21, 2014

Homework Help: Trigonometry

Posted by Holly on Wednesday, July 31, 2013 at 9:47pm.

Find all solutions of 4(cos(x))**2-4 sin(x)-5=0 in the interval (6pi, 8pi)

I tried to work it out and got: 4(cos**2x)-4cosx -9 = 0, but I can't figure out what cosx = from there to finish the problem.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Trigonometry - Find all solutions of 4 (cos (x)**2)-1=0 in the interval (6pi, ...
trig - Find all solutions of the equation. Leave answers in trigonometric form. ...
pre calc trig check my work please - sin x + cos x -------------- = ? sin x sin ...
Precal - I do not understand how to do this problem ((sin^3 A + cos^3 A)/(sin A...
tigonometry - expres the following as sums and differences of sines or cosines ...
math - Prove that for all real values of a, b, t (theta): (a * cos t + b * sin t...
trig - it says to verify the following identity, working only on one side: cotx+...
TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
Trigonometry - Please review and tell me if i did something wrong. Find the ...
trig - 2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3&#...

Search
Members