Wednesday

April 23, 2014

April 23, 2014

Number of results: 8,093

**Trig/PreCalc**

Thanks!
*Monday, December 29, 2008 at 8:01pm by Tim*

**precalc/trig**

5/(x+2) - (x-3)/(x^2-4x+5) or, 5/(x+2) - [(x-2)-1]/[(x-2)^2 + 1]
*Saturday, December 3, 2011 at 11:19am by Steve*

**precalc/trig - PS**

That would be in m, not m^2 :-(
*Tuesday, February 21, 2012 at 8:48am by Steve*

**Precalc and trig**

thanks! i accidentally posted this twice
*Sunday, February 22, 2009 at 6:49pm by hayden*

**precalc/trig help please**

Duh. you are correct. Thank you
*Tuesday, February 21, 2012 at 8:48am by drwls*

**Precalc/Trig 1**

show that (√11/6)^2 + (5/6)^2 = 1 , (it is)
*Monday, October 8, 2012 at 8:53am by Reiny*

**Precalc/Trig 2**

so you given y = -√3 x^2 + y^2 = 2^2 x^2 + 3 = 4 x^2 = 1 x = ± 1 , but the point is in IV so x = 1
*Monday, October 8, 2012 at 8:57am by Reiny*

**precalc**

Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1, where your theta is in degrees. B. The Trig form of z1*z2, where z2=5[cos(60degrees)+isin(60degrees)] C. The Trig Form of (z1)^4
*Monday, December 5, 2011 at 1:34pm by Joshua*

**trig/PreCalc**

Find all real zeros of the function y = -7 + 4
*Tuesday, March 23, 2010 at 12:32am by jodi*

**Precalc with Trig**

No, I don't just my professor trying to trick us, thanks for the help!
*Sunday, April 7, 2013 at 1:42pm by Natalie*

**Precalc with Trig**

There isn't a typo this is the equation my professor gave us, thanks for the help!
*Thursday, April 11, 2013 at 2:04pm by Natalie*

**trig/precalc**

bobpursely: Thank you so much! God bless you for taking the time to help!
*Tuesday, April 10, 2012 at 6:07pm by tabby*

**Precalc/Trig**

Find the smallest positive number t such that e^sin(t)=1/2
*Saturday, October 20, 2012 at 11:22pm by Liz*

**Trig/PreCalc**

Factor the Polynomial completely: 10x^4y-20x^2y^2
*Monday, December 29, 2008 at 8:01pm by Nuna*

**Trig/Precalc**

the ratio of height to shadow length is the same, so h/3.5 = 8/5 I imagine you can solve that for h.
*Sunday, November 24, 2013 at 6:06pm by Steve*

**trig/PreCalc**

You must have copied the problem wrong, y = -7 +4 = -3 It never equals zero.
*Tuesday, March 23, 2010 at 12:32am by drwls*

**Precalc/Trig**

what angle does the line y=6/7x make on the xy plane with a positive x axis?
*Saturday, October 20, 2012 at 11:03pm by Liz*

**Precalc/Trig**

what angle does the line y=6/7x make on the xy plane with a positive x axis?
*Saturday, October 20, 2012 at 11:04pm by Liz*

**Precalc/Trig 1**

What equation would you use to show that the point ((square root of 11)/(6), (5/6))is on the unit circle?
*Monday, October 8, 2012 at 8:53am by Greg*

**Trig/Precalc**

solve 6=e^0.2t Round your answer to the nearest hundredth Someone please help me - I don't understand this problem at all!
*Thursday, April 19, 2012 at 12:55pm by tabby*

**Precalc**

LS = cos(-x) - sin(-x) = cosx + sinx = RS These are based on standard trig relationships that you should know and recognize
*Tuesday, November 13, 2012 at 9:43am by Reiny*

**precalc/trig help please**

The area of a circle is 18pi square meters. What is the radius (leaving answer in simplest radical form)
*Tuesday, February 21, 2012 at 8:48am by Carlee'*

**Precalc/Trig Word Problem**

Greg ! Enough of "homework - dumping" Show some work before any more help is given.
*Monday, October 8, 2012 at 9:12am by Reiny*

**precalc/Trig**

using the same addition formulas as before, note that 82.5 = 60 + 22.5 12 = 30-18
*Saturday, November 10, 2012 at 2:11am by Steve*

**Precalc/Trig 2**

The point P lies in the 4th quadrant and is located on a circle of radius 2. Find the missing coordinate for P. (___, (negative square root of 3)).
*Monday, October 8, 2012 at 8:57am by Greg*

**trig/precalc**

actually, that's heading, not bearing. Adding up the x- and y-components of the two speeds, you get (507.1,531.2) so, the speed is 734.4 mph at N43.7°E
*Sunday, December 16, 2012 at 5:35pm by Steve*

**Precalc-possible or impossible (trig)**

is this possible? sec __=-.04
*Monday, December 8, 2008 at 12:00am by yv*

**Precalc with Trig**

What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0
*Thursday, April 11, 2013 at 2:04pm by Natalie*

**precalc and trig**

i posted a sorry. i posted this twice on that one. And i dont understand how RS=LS and thanks
*Sunday, February 22, 2009 at 8:18pm by hayden*

**precalc/trig**

Solve the Logarithmic equation algebraically. Give an Exact Answer and an approximation for x to four decimal places. 20 log(2x+2)=45
*Monday, December 5, 2011 at 2:01pm by Alexander*

**precalc/trig**

Write the partial fraction decomposition of the rational expression. 4x^2–19x+31/ (x+2)(x^2–4x+5)
*Saturday, December 3, 2011 at 11:19am by Robert*

**Precalc with Trig**

cos^2 Ø - sin^2 Ø = 6 cos 2Ø = 6 no solution, the cosine of anything cannot be greater than 1 do you have a typo?
*Sunday, April 7, 2013 at 1:42pm by Reiny*

**precalc/trig**

Find the trigonometric form of the number. (Round any angles to two decimal places.) −8 − i
*Tuesday, November 29, 2011 at 11:27am by Alex*

**Precalc/Trig**

The slope of a line is the same as the tanØ , where Ø is the angle it makes with the x-axis so in y = 6/7x we have tanØ = 6/7 Ø = appr. 40.6°
*Saturday, October 20, 2012 at 11:04pm by Reiny*

**Trig?Precalc**

write the rectangular equation x^2+y^2=6 in polar form. I do not want people to just post the answer! Please, show your work so that I can understand how to do these kinds of problems myself! Thank you and God Bless!
*Thursday, April 19, 2012 at 12:40pm by tabby*

**PreCalc (Sine)**

I meant to include the webpage on the CAST rule http://www.physics.uoguelph.ca/tutorials/trig/trigonom2.html
*Thursday, October 25, 2007 at 10:36pm by Reiny*

**Precalc-possible or impossible (trig)**

nope, not defined the secant is the reciprocal of the cosine. The cosine function has a range between -1 and 1 so the secant of any angle has to be ≥ 1 or ≤ -1
*Monday, December 8, 2008 at 12:00am by Reiny*

**Precalc/Trig Word Problem**

From the top of a 200-ft lighthouse, the angle of depression to a ship in the ocean is 23 degrees. How far is the ship from the base of the lighthouse?
*Monday, October 8, 2012 at 9:12am by Greg*

**precalc and trig**

cos^2 (a+x) -sin^2 a=cos x * cos(2a+x)
*Sunday, February 22, 2009 at 8:18pm by hayden*

**precalc/trig help please**

pi*R^2 = 18*pi R^2 = 18 R = 3*sqrt2 m^2 = = 4.24 m^2
*Tuesday, February 21, 2012 at 8:48am by drwls*

**precalc/trig**

olve for the interval [0, 2pi]. cos(x+ pi/4)+cos(x- pi/4)=1
*Thursday, November 29, 2012 at 1:25am by bob*

**Precalc and trig**

cos^2 (x+a)-sin^2(a)= (cos x)(cos (2a+x)) prove using only side i worked on the left side...
*Sunday, February 22, 2009 at 6:49pm by hayden*

**precalc/trig**

log(2x+2) = 45/20 = 2.25 assuming natural logs, 2x+2 = e^2.25 x = (e^2.25 - 2)/2 x = 3.7439
*Monday, December 5, 2011 at 2:01pm by Steve*

**Precalc with Trig**

cos^2 - cos - 6 = 0 (cos-3)(cos+2) = 0 cos = 3 or -2 Bzzzt. |cos| <= 1, so not possible. If there's a typo, fix it and apply the same steps.
*Thursday, April 11, 2013 at 2:04pm by Steve*

**Precalc and trig**

thanks for catching that typo, it is so hard to type those complicated trig expressions without making some errors. on RS it looks like I forgot to multiply cosx by that last term so from cosx[cos^2acosx – sin^2acosx – 2sinacosasinx] = cos^2acos^2x – sin^2acos^2x - ...
*Sunday, February 22, 2009 at 6:49pm by Reiny*

**precalc please**

I suspect you need the sine of the sum of two angles, 45+30 Sin(A+B)=SinAcosB+cosAsinB http://www.sosmath.com/trig/Trig5/trig5/trig5.html I suspect you are suffering from lack of routine use of flash cards. Millions of students before you have suffered thru memorizing these, ...
*Monday, January 23, 2012 at 9:46am by bobpursley*

**Precalc/Trig**

just plug in you addition formulas: sin(u+v) = sinu cosv + sinv cosu = (2/5)(1/3) + (√21/5)(√8/3) = 2(1+√42)/15 do the others likewise. If necessary, draw triangles and label the sides to evaluate the other functions of u,v,x,y
*Saturday, November 10, 2012 at 12:48am by Steve*

**Trig/PreCalc**

10x2y(x2 -2y)
*Monday, December 29, 2008 at 8:01pm by bobpursley*

**Trig?Precalc**

Do you not recognize the equation as that for a circle of radius √6 ? its center is at (0,0), so it's the most basic of any polar equation: r = 6 FYI, if you want us to show our work, show us how far you got, so we know where to concentrate the help.
*Thursday, April 19, 2012 at 12:40pm by Steve*

**Precalc/Trig**

Find all values of x, 0<x<(pi/2) for which (1/( root 3))<cotx<(root 3)
*Wednesday, October 10, 2012 at 7:22pm by Patrick*

**Precalc/Trig**

wave is modeled by the function ... h(t) = 3cos(p/10)*t What is the period of the wave (T) *frequency (F) is defined as the number of cycles of the motion per second. What is the relationship between F and T? Find the wave height (H) which is the vertical distance between the ...
*Wednesday, September 26, 2012 at 9:17am by George*

**Trig/PreCalc**

Teach me how to express 5sqrt3 - 5i in polar form please. I don't want you to do the work for me. Just show me the steps I need to do the work properly on my own. Otherwise I will not pass this class or the exam when I enter college, and I do not want to retake PreCalc. Its a ...
*Friday, April 13, 2012 at 3:44pm by tabby*

**Precalc/Trig**

evaluate the expression assuming that cos(x)=1/7, sin(y)=1/3, sin(u)=2/5 and cos(v)=1/3. what is cos(u+v)? sin(x-y)? and tan(u-v)?
*Saturday, November 10, 2012 at 12:48am by Liz*

**precalc/trig**

y = -1 x = -8 tanθ = y/x = 8 arctan 8 = 82.87° = 1.45 θ = 1.45 + pi = 4.59 r^2 = 1+64 = 65 So, -8-i = (√65,4.59)
*Tuesday, November 29, 2011 at 11:27am by Steve*

**trig/precalc**

y= A sin Theta you can graph that. Now let A= 3.55 Now let theta= x-PI/4 That means theta is zero when x=PI/4. So it is a sine curve shifted to the right by PI/4 You can plot that.
*Tuesday, April 10, 2012 at 6:07pm by bobpursley*

**Trig/precalc**

Cos[x + (7 Pi)/4] + Cos[x - (7 Pi)/4] = 1
*Tuesday, February 12, 2013 at 10:22pm by Joe*

**trig/precalc**

An airplane with a ground speed of 750 mph and a bearing of N 40 E encounters a wind of 50 mph with a bearing of S 30 E. Find the bearing and ground speed of the plane.
*Sunday, December 16, 2012 at 5:35pm by Mia*

**Precalc**

Hello, good afternoon. I need help with my precalc hw. we are learning about finding zeros I dont which method I should use for this problem: if i is a zero of x^3+3x^2+ix+(4+i) what do i do? synthetic divison? or long division? when i did long division i got a werid ...
*Tuesday, October 14, 2008 at 4:06pm by Samya*

**Trig/Precalc**

YOu will have to use logarithms take ln of both sides ln 6 = ln (e^0.2t) ln6 = .2t lne, but lne = 1 t = ln6/.2= appr 8.959
*Thursday, April 19, 2012 at 12:55pm by Reiny*

**precalc h**

sin(theta)/1-cos(theta) + 1-cos(theta)/sin(theta) = 2csc(theta) That question makes absolutely no sense.. could someone help me? or lead me in the direction to figuring it out? and.. (Beside the trig functions is theta) 1+1/cos = tan^2/sec-1
*Sunday, December 9, 2012 at 8:17pm by sam*

**Precalc with Trig**

What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0
*Sunday, April 7, 2013 at 1:42pm by Natalie*

**precalc**

1. Get the inverse of each side in cos(θ)=-((3)/(7)). Cos^-1 (3/7) = theta. 2. From trig identities, we know sin2θ = 2sinθcosθ Substitute that in for sin2θ and just solve since you figured out θ in part 1 and you were given what cosθ equals, ...
*Tuesday, March 8, 2011 at 9:16pm by Amelie*

**Trig/Precalc**

a lamp post that is 8 feet high casts a shadow 5 feet long. how tall is the person standing beside the lamp post if his shadow is 3.5 feet long
*Sunday, November 24, 2013 at 6:06pm by Marusa*

**Precalculus**

Try some of the online sources listed here. http://mathforum_search_20140419.org/library/topics/precalc/
*Friday, January 8, 2010 at 2:40pm by Ms. Sue*

**trig/precalc**

a plane flies 810 miles form Franklin to Centerville with a bearing of 75 degrees (clockwise from north). then it flies 648 miles from centerville to rosemont with a bearing of 32 degrees. find the straight-line distance and bearing from rosemont to franklin.
*Thursday, January 20, 2011 at 7:16pm by mimi*

**precalc and trig**

see http://www.jiskha.com/display.cgi?id=1235346549 don't tell my I did all that work, and you didn't even look at it.
*Sunday, February 22, 2009 at 8:18pm by Reiny*

**Trig 30**

x/2 = 2pi/3 yields a unique solution of x = 4pi/3 Does this answer come from some trig equation? Your subject title suggests that. In that case find the period of the trig function, then add k(period) to 4pi/3, k an integer.
*Friday, March 19, 2010 at 7:59pm by Reiny*

**Emergency math help!!!**

http://courses.wccnet.edu/~palay/precalc/22mt01.htm
*Thursday, November 7, 2013 at 8:29pm by bobpursley*

**trig/precalc**

Compute the north and east displacements of both legs of the journey. Add the two north displacements. Call that sum Y Y = 810 cos75 + 648 cos32 = __ Add the two east displacements. Call that sum X. X = 810 sin75 + 648 sin32 = ___ Straight-line distance = sqrt[X^2 + Y^2]
*Thursday, January 20, 2011 at 7:16pm by drwls*

**trig**

Subtract 2 pi from 7pi/3. The trig functions of 7 pi/3 will be the same values as the trig functions of pi/3, which is 60 degrees. The cosine of pi/3 is 1/2. That makes the secant 3. The tangent is sqrt3 You should be able to look up or figure out the other funtions of that ...
*Tuesday, January 12, 2010 at 9:50pm by drwls*

**math**

could someone please refresh my memory of the basic trig functions? ex) cos^2 + sin^2 = 1? That is a trig identity. http://www.sosmath.com/trig/Trig5/trig5/trig5.html
*Thursday, April 12, 2007 at 10:18pm by raychael*

**Math - Solving Trig Equations**

Start by recalling the most important identity. My math teacher calls this "the #1 Identity." sin^2(x) + cos^2(x) = 1 We want to simplify our trig equation by writing everything in terms of sine. Let's solve the #1 Identity for cos^2(x) because we have that in our trig ...
*Wednesday, November 21, 2007 at 6:29pm by Michael*

**trig/precalc**

a car's flywheel has a timing mark on it's outer edge. the height of the timing mark on the rotating flywheel is given by y=3.55sin[x - (pi/4)]. graph one full cycle of this function. I was not taught how to graph a function like this, only the simple y= sin x and y= cos x ...
*Tuesday, April 10, 2012 at 6:07pm by tabby*

**Precalc and trig**

how does cos^2x(cos^2a – sin^2a) - 2sinacosasinx = cos^2x(cos^2a – sin^2a) – 2cosxcosasinxsina
*Sunday, February 22, 2009 at 6:49pm by hayden*

**Precalc**

Your lack of brackets make your equations totally ambiguous. Secondly your trig ratios have no argument, sin and cos by themselves are meaningless that's like saying 5 + √ I happen to know the second one , so (1+ sinØ)/(1 - sinØ) = (secØ + tanØ)^2 LS = (1+ sinØ)/(1 - sin...
*Monday, February 4, 2013 at 6:52pm by Reiny*

**trig**

What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
*Monday, April 21, 2008 at 8:53pm by Priya*

**trig**

What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
*Tuesday, April 22, 2008 at 12:03am by Chaitanya*

**trig**

how do i do this? give the signs of the six trig functions for each angle: 74 degrees?
*Wednesday, December 3, 2008 at 6:59pm by Tay*

**trig**

express the trig. ratios sinA,secA n tanA in terms of cotA.
*Saturday, May 7, 2011 at 5:49am by Anonymous*

**trig**

How do you solve cos(2arcsin 1/4) using inverse trig. functions??!! PLEASE HELP ME!
*Monday, May 9, 2011 at 11:20am by Tor*

**Trig**

Find (if possible) the trig function of the quadrant angle. sec 3pi/2
*Monday, June 6, 2011 at 4:00pm by Master chief*

**trig**

find the 5 trig ratios when sin theta = -5/13 and lies in quadrant 3
*Wednesday, September 14, 2011 at 10:38pm by karen*

**graphing trig functions**

I see the equation of a straight line, not a trig function
*Sunday, May 20, 2012 at 10:15pm by Reiny*

**Trig**

surely you have learned the basic definitions of the trig functions, tanØ = y/x = 4/3
*Sunday, January 20, 2013 at 5:17pm by Reiny*

**trig**

its in the first chapter of my trig course. i know its review frm geometry and alg
*Friday, November 14, 2008 at 11:25am by y912f*

**trig**

simplify to a constant or basic trig function.. 1+tan(x)/1+cot(x)
*Sunday, March 14, 2010 at 1:14pm by hilde*

**Trig**

This subject is not trig. You will have to use your own graphic calculator.
*Sunday, May 15, 2011 at 12:10am by drwls*

**trig**

first of all, this is not trig, secondly your expression makes no sense.
*Monday, January 7, 2013 at 10:03pm by Reiny*

**trig**

What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
*Sunday, April 20, 2008 at 10:27pm by Joshua*

**trig**

What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
*Monday, April 21, 2008 at 12:33am by Joshua*

**trig**

What is the shift along x of the following trig functions? y = (3sinx/2) + 4 y = -2sin(x)-4 y = sin(-3x + 3)
*Monday, April 21, 2008 at 12:34am by Amandeep*

**Precalculus**

How would you solve this trig function: cos2x=sin^2-2 how do you know what trig identities to use?
*Saturday, August 6, 2011 at 5:39pm by Jess*

**Trig**

find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?
*Thursday, September 1, 2011 at 9:16pm by ALISON*

**trig**

I don't know to find the derivative of the following trig functions. Please help. f(x)= cotx h(x)= secx i(x)= cscx
*Thursday, January 19, 2012 at 8:45am by Claire*

**trig**

TRIG Identities, Gr. 12: Prove: cot4x=1-tan^2x/2tan2x
*Thursday, May 23, 2013 at 2:56pm by Josh*

**Trig**

Does anybody know a good website that will hlp me with finding the six trig functions of a point NOT on the unit cricle?
*Wednesday, September 16, 2009 at 7:59pm by Anonymous*

**trig**

use the unit circle to find the exact value for all the trig functions of è=2ð/3.
*Monday, February 1, 2010 at 9:54pm by Anonymous*

**trig**

find the 5 other trig functions if cos(theta) = square root of 2/2 and cotangent is less than 0
*Wednesday, June 9, 2010 at 7:04pm by kelly*

**trig**

I don't know to find the derivative of the following trig functions. Please help. f(x)= cotx h(x0= secx i(x)= cscx
*Thursday, January 19, 2012 at 8:45am by Claire*

**trig! please help!**

to bobpursely: i need to simplify the expression using trig identities. and no i meant for there to only be x
*Sunday, May 13, 2012 at 8:59pm by Brianna*

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