Wednesday

October 1, 2014

October 1, 2014

Posted by **Kelly** on Monday, March 14, 2011 at 5:24pm.

- Math -
**Reiny**, Monday, March 14, 2011 at 6:11pmummmhhh, wouldn't that just be 13π/15 ?

or, since the sine is + in both the 2nd or 1st quadrant, and

since 13π/15 is in quadrant II we could also have

π - 13π/15 = 2π/15

check with calculator, set to radians

enter:

13

x

π

÷

15

=

sin

=

2nd sin

= .41887902 which is 2π/15

**Answer this Question**

**Related Questions**

trig - find exact value cos(13pi/15)cos(-pi/5)-sin(13pi/15)sin(-pi/5)

MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...

Math - 3. find the four angles that define the fourth root of z1=1+ sqrt3*i z...

Trigonomety question - How do you find the exact value of Sin(13pi)?

Trigonometry - If cos(a)=1/2 and sin(b)=2/3, find sin(a+b), if 1) Both angles ...

Precalculus/Trig 6 - Find the exact value of the following trigonometric ...

math - Eliminate the parameter (What does that mean?) and write a rectangular ...

Trig hep, please? Thank you! - 1. Find the exact value of sin(195(degrees)) 2. ...

trig - find the exact value of sin(u+v) given that sin u=3/5 and sin v= 15/17

Math - How to find the exact value of tan(sin^-1x/2) I'm having trouble with ...