Friday

September 19, 2014

September 19, 2014

Posted by **Jeff** on Thursday, January 20, 2011 at 11:41pm.

- math (trig) -
**drwls**, Friday, January 21, 2011 at 11:45am-1/3 = cos 2theta = 1 - 2 sin^2 theta

2 sin^2 theta = 4/3

sin theta = sqrt(2/3)

cos theta = sqrt(1 - 2/3) = -sqrt(1/3)

(minus since theta must be in quadrant 2)

tan theta = -sqrt2

theta = 125.26 degrees

You draw the figure

**Answer this Question**

**Related Questions**

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

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

trig - If sin 2 theta = (2/5) in Quadrant 2, find sin theta, cos theta, tan ...

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

precalc h - sin(theta)/1-cos(theta) + 1-cos(theta)/sin(theta) = 2csc(theta) That...

math - I have a question I have been working on since yesterday and I am not ...

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...

easy trig - If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...