Posted by Maddie on Tuesday, November 27, 2012 at 11:21pm.
Should this be Q IV (quadrant 4)
tan-1(-4/3) = -53.13 degrees (-53.13 degrees = 360 + -53.13 = 306.87, is in quadrant 4)
Evaluate with your calculator cos(2*306.87)
Related Questions
Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
Trig. - sec^2xcotx-cotx=tanx (1/cos)^2 times (1/tan)-(1/tan)=tan (1/cos^2) times...
Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 &...
trig - If tan y = -4/3 and y is in Q I'VE find cos 2y
Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to...
trig 26 - simplify to a constant or trig func. 1. sec ²u-tan ²u/cos &...
Trig - If cosx = 10/19 an pi < x < 2pi, find the exact value of ...
trigonometry hlp me - 6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin &#...
TRIG - what is another form of: sin (A+B) sin (A-B)/ cos^2 A cos^2 B a) cos^2 A...
trig - Show that 1-cos2A/Cos^2*A = tan^2*A 1-cos2A/Cos^2*A = [Cos^2(A) - Cos(2A...
For Further Reading
