Sunday

February 1, 2015

February 1, 2015

Posted by **sam** on Thursday, November 11, 2010 at 4:40pm.

cot[arccos(-2/3)]

- trigonometry -
**MathMate**, Thursday, November 11, 2010 at 4:52pmcos(θ)=-2/3

So θ is in the second or third quadrant. There is not enough information to be sure of which.

adjacent = -2

hypotenuse = 3

opposite = ±√(3²-(-2)²)

= ±√(5)

Therefore

cot(θ)

=adjacent/opposite

=-2/(±√(5))

= ±(2/√(5))

=±(2√(5)/5)

**Answer this Question**

**Related Questions**

trig - exact value of cot[arccos(-2/3)]

Trigonometry - 1. Find the exact value of the following (Think identity) Cos(2 ...

math - determine the exact value of (cot pi/3) + (csc pi/3) / (cos pi/4). how is...

Math - I need to find the exact value of tan(arccos(-sqrt 11/6)).

Precal - Find the exact value of the expression. sin(arccos sqrt(5)/5)

pre-calc - Can someone help me find the exact value of 4csc(3pi/4)-cot(-pi/4)? ...

Math - Calculate the limit: lim(((arccos x)^(n+1))/((arccos x)^n) with x tends ...

trigonometry - 5. If cot 2θ = 5/12 with 0 ≤ 2θ ≤ π...

Trigonometry - Write the trigonometric expression as an algebraic expression. 1...

Math - Find the exact value: 1.) cos^-1(sin(pi/2)) 2.) arccos(cos(7pi/2))