Algebra 2
posted by Ana .
Is the answer to: cosθ, if tanθ = 1 and 180° < θ < 270° ; (√ 2)/2 ?

close, but remember that in the third quadrant the cosine is negative, so
cosØ = √2/2
Respond to this Question
Similar Questions

Math  Calculus
The identity below is significant because it relates 3 different kinds of products: a cross product and a dot product of 2 vectors on the left side, and the product of 2 real numbers on the right side. Prove the identity below.  a … 
Trigonometry
Which of the following is equivalent to 1 − cos 2 θ/cos 2 θ? 
PreCalculus
If θ represents an angle such that sin2θ = tanθ  cos2θ, then sin θ  cosθ = A. √2 B. 0 C. 1 D. 2√2 What equation can I use to solve this problem? 
math trigono
1. If tanθ = –√3 , what is the value of cot ? 
Trignometry
Let θ be the angle between the xaxis and the line connecting the origin O(0,0) and the point P(−3,−4), where 180∘<θ<270∘. Given that sinθ+cosθ+tanθ=−a/b, where a and b are … 
Math
θ is an angle such that 180∘<θ<270∘, and sinθ=−12/13. What is the value of 180(sin^2 θ/2+cos^2 θ/2 +tan^2 θ/2)? 
Trigonometry
There are four complex fourth roots to the number 4−4√3i. These can be expressed in polar form as z1=r1(cosθ1+isinθ1) z2=r2(cosθ2+isinθ2) z3=r3(cosθ3+isinθ3) z4=r4(cosθ4+isinθ4), … 
Complex angles
There are four complex fourth roots to the number 4−43√i. These can be expressed in polar form as z1=r1(cosθ1+isinθ1) z2=r2(cosθ2+isinθ2) z3=r3(cosθ3+isinθ3) z4=r4(cosθ4+isinθ4), … 
Trig
Given that tan θ =  (√3/8) and θ is in QII, find the exact value of a. r = b. csc θ c. cos θ d. cot θ 
Precalc/Trig
Sorry there are quite a few problems, but I just need to know if these are correct (and if they aren't, where I went wrong): 1. Solve these equations. tanθ = √3 θ = 2π/3 + kπ θ = 5π/3 + kπ …