Saturday

December 20, 2014

December 20, 2014

Posted by **stacey graham** on Saturday, March 27, 2010 at 5:58pm.

tan(B+C) ?

At the end of my equation I had (sqrt45/15) over (1-sqrt15/15) , how do I rationalize or did I make an error in calculation

- trig -
**Reiny**, Saturday, March 27, 2010 at 6:25pmyou should have had tanB = -1/√3 and tanC = -1/√45

for tan(B+C) I got (-√15 - √3)/(√45 - 1)

(which is the right answer, because I used my calculator to find the actual angles.)

we could change the answer to

(-√15 - √3)/(3√5 - 1) and then multiply top and bottom by (3√5 + 1)/(3√5 + 1) if you have to rationalize it.

**Answer this Question**

**Related Questions**

trig - find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in ...

trig - find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in ...

Trig - find the exact value of the expression using the provided information. ...

Trig - find the exact value of the expression using the provided information. ...

Mathematics - I need help finding the exact value of sin (a + b), given that sin...

Trig - find (s+t) given that cos s=1/3 with s in quad I and sin T=-1/2 with t in...

Geometry - Draw a pair of quadrilaterals where the 1st quad. is congruent to the...

Math - Draw a pair of quadrilaterals where the 1st quad. is congruent to the 2nd...

Math - OOPS! Draw a pair of quads. where the angles of the 1st quad. are ...

Trig - Given sin theta = -3/5 and 0 is in quad 2, find Cos theta and tan theta