Monday

October 20, 2014

October 20, 2014

Posted by **pete** on Tuesday, July 21, 2009 at 3:35pm.

and pie/2<theta<pie what is the value of cos(theta)

- math -
**Reiny**, Tuesday, July 21, 2009 at 4:48pmmake a rough sketch of a right-angled triangle in the second quadrant with a hypotenuse of 4 and a vertical leg of 1.

(remember sin(angle) = opposite/hypotenuse)

by Pythagoras, the other side must be √15

in the second quadrant the cosine is negative, so

cos(theta) = -√15/4

**Answer this Question**

**Related Questions**

Calculus - I wanted to confirm that I solved these problems correctly (we had to...

Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...

Trig - Claim: For all theta such that -pie/2<theta<pie/2 the following ...

Algebra II - Multiple Choice Which expression is NOT equivalent to 1? (theta) ...

trig - If sin theta is equal to 5/13 and theta is an angle in quadrant II find ...

trigonometry - can you correct the rest for me please? Express each as a ...

trigonometry - can you correct the rest for me please? Express each as a ...

trigonomtry - can you correct the rest for me please? Express each as a function...

Precalculus 2 - Similiarly to a question I asked previously I took the same ...

Trig - Which expression equivalent to: cos(theta + pi/2). A)cos theta B)-cos ...