# Math

posted by .

cot (theta)=-9/8, cos (theta)<0

• Math -

Are we solving for theta ??

if so, then
tan Ø = -8/9 and if cos Ø < 0
Ø must be in quadrant II

angle in standard position is 41.63°
( since tan 41.63° = +.888889 or 8/9 )

so Ø = 180 - 41.63 or 138.37°

check:
tan 138.37 = -.888889
cos 138.37 is negative.

Change your calculator to Radians if you want those units

## Similar Questions

2. ### Algebra II

Which of the following expressions are not equal to 1?
3. ### Calculus

I wanted to confirm that I solved these problems correctly (we had to convert the polar curves to Cartesian equations). 1.rcos(theta)=1 x=1 2.r=2*sin(theta)+2*cos(theta) r^2=2rsin(theta)+2rcos(theta) x^2+y^2=2y+2x (a little unsure …
4. ### Trigonometry

I don't understand how I'm supposed set the problem up or what theta is... Use the given function value(s), and trigonometric identities (including the cofunction identities), to find the indicated trigonometric functions. sec theta …
5. ### Algebra II

Multiple Choice Which expression is NOT equivalent to 1?
6. ### Calculus

sec theta 5 need to find cos theta cot theta cot (90-theta) sin theta not sure what to do completely confused on this stuff
7. ### trig

If sin theta is equal to 5/13 and theta is an angle in quadrant II find the value of cos theta, sec theta, tan theta, csc theta, cot theta.
8. ### Trigonometry

Prove the following identities: 1. (tan theta - sin theta)^2 + (1-cos theta)^2 = (1-sec theta) ^2 2. (1-2cos^2 theta) / sin theta cos theta = tan theta - cot theta 3. (sin theta + cos theta ) ^2 + (sin theta - cos theta ) ^2 = 2 Thank …
9. ### Trigonometry

Prove the following identities: 1. (tan theta - sin theta)^2 + (1-cos theta)^2 = (1-sec theta) ^2 2. (1-2cos^2 theta) / sin theta cos theta = tan theta - cot theta 3. (sin theta + cos theta ) ^2 + (sin theta - cos theta ) ^2 = 2 Thank …
10. ### Precalculus

Circle O below has radius 1. Eight segment lengths are labeled with lowercase letters. Six of these equal a trigonometric function of theta. Your answer to this problem should be a six letter sequence whose letters represent the segment …

More Similar Questions