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February 1, 2015

February 1, 2015

**Recent Homework Questions About Trigonometry**

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**geom/trig**

Using scissors to cut a rectangular piece of paper from one corner ro the opposite corner. The cut is 36 cm long and makes a 34 degree angle to the uncut edge. How many cm long is the paper (from the corner where he started the cut?
*Monday, January 16, 2012 at 2:05pm*

**trig**

I have a couple of these and cannot locate directions I can understand-please help! Draw the graph of y=3cos(2x) for 0< or= x < or = 2 pi
*Monday, January 16, 2012 at 1:20pm*

**Trig**

(x+3)^2/4^2 + (y-2)^2/5^2 The location of the Foci are at: a.(-3,-1) and (-3,-5) b. (-3,2) and (-3,5) c. (-3,-3) and (-3,7) d. (-3,1) and (-3,-5) I get (-3,2) and (-3,5) Am I correct?
*Saturday, January 14, 2012 at 2:08pm*

**trig**

From the top of a hill 700 ft. high, an observer notes that the angles of depression of two successive markerstones on a level ground, which leads straight away from the hill are 5 degree and 15 degree respectively. Find the distance between the two markerstones.
*Saturday, January 14, 2012 at 5:27am*

**Trig-Please check**

What are polar coordinates of (4,6) 1.Round r to nearest hundredth and theta to nearest hundredth of RADIAN My work: r^2 = x^ + y^2 r^2 = 4^2 + 6^2 r^2= 16 +36 r^ =52 r=7.21 I'm stuck on how to do theta in Radians, could you please assist
*Friday, January 13, 2012 at 11:20am*

**trig**

3x^2+16y^2=48 conic sections
*Friday, January 13, 2012 at 2:05am*

**trig**

I need help finding derivatives and antiderivatives. Given: f(x),find f'(x) 1. f(x)-2x^6 2. f(x)= -3x +7 3. f(x)= 3x^2 - 5x 4.f(x)= 1/2x^2 - x + 4
*Thursday, January 12, 2012 at 4:05pm*

**Trig**

IfA=340°, prove that 2cosA/2 = -(v1+sinA) - (v1-sinA)
*Thursday, January 12, 2012 at 5:12am*

**trig**

evaluate sin (11pi/6) to the nearest thousandth.
*Wednesday, January 11, 2012 at 11:49pm*

**trig**

write sec theta in terms of sin theta when theta lies in quadrant III
*Wednesday, January 11, 2012 at 11:43pm*

**trig**

what is the amplitude of y=2+cos(-1/2 theta)?
*Tuesday, January 10, 2012 at 8:22am*

**Trig**

The question is: Set up a 2 column proof to show that each of the equations is an identity. Transform the left side to become the right side. a. (tan + cot)^2 = sec^2 + csc^2 I'm having trouble with this. b. (cos + sin)/cos + (cos - sin)/sin = csc sec I'm having ...
*Sunday, January 8, 2012 at 9:48pm*

**Trig**

(sin/cos)/ ( 1/cos - 1) = I'm stumped
*Sunday, January 8, 2012 at 7:49pm*

**Trig**

Proving Identities: 2 columns (tan + cot)^2 = sec^2 + csc^2 I'm having trouble breaking down the left side to = the right side.. Any help please
*Sunday, January 8, 2012 at 7:38pm*

**trig**

how do you work find sin (a-B)beta sign. sin a = 12/13,a lies in quadrant II,and cos B = 15/17, B lies in quadrant I.
*Sunday, January 8, 2012 at 6:45pm*

**trig**

solve for x in the following equations: 1) sin(arcsin x) = 1 2) 2arcsin x = 1 3) cos(arccos x) = 1/3
*Sunday, January 8, 2012 at 10:34am*

**Trig**

the horizontal speed of an airplane is 183mph. the magnitude of the plane's velocity is 200mph. write an expression describing the angle the angle the plane is climbing my solution: cos-1 183/200 is this right
*Sunday, January 8, 2012 at 6:32am*

**trig**

express 4/5-radical 13
*Thursday, January 5, 2012 at 8:59pm*

**trig**

express 4/5-ã13 plz
*Thursday, January 5, 2012 at 8:58pm*

**trig**

express 4/5-ã13 plz
*Thursday, January 5, 2012 at 8:57pm*

**Trig**

the center of a circle x^2 + y^2 + 8y =1 is a. (0,-2) b. (0,4) c. (0,1) d. (0,-4) I believe the answer is (0,4) Am I correct ?
*Wednesday, January 4, 2012 at 10:34pm*

**Trig**

The center of the circle (x+2)^2 + (y-3)^2 =1 is a. (2,3) b. (-2,3) c. (2,-3) d. (-2,-3) I believe b. is the answer, is that correct?
*Wednesday, January 4, 2012 at 10:13pm*

**Trig**

The radius of: (x+2)^2 + (y-3)^2 =9 is 3 is this correct?
*Wednesday, January 4, 2012 at 10:04pm*

**Trig**

If the center of a circle is at (2,2) with a radius of 4 the equation of the graph would be : a) (x-2)^2 + (y-2)^2 = 16 b) (x+2)^2 + (y+2)^2 = 16 I think it would be b is that correct?
*Wednesday, January 4, 2012 at 10:02pm*

**trig**

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ...
*Wednesday, January 4, 2012 at 8:20am*

**trig**

prove that tan^2x+ sec^2x =1
*Tuesday, January 3, 2012 at 3:58pm*

**Trig**

Prove that 1 + tanAtanA/2 = tanAcotA/2 -1 = secA
*Tuesday, January 3, 2012 at 9:40am*

**Trig**

Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??
*Monday, January 2, 2012 at 8:04pm*

**Trig**

sinAsin2A+sin3Asin6A+sin4Asin13A/sinAcos2A+sin3Acos6A+sin4Acos13A = tan9A
*Monday, January 2, 2012 at 10:54am*

**Trig**

Half angle identities Find exact values of a) cos 1/2 b) sin 1/2 c) tan 1/2 based on: cos = 1/5 greater than 270 deg less than 360 deg. I get a) - rt 3/5 b) rt24/5 and c) does not work out at all .... Help please.. book says for answers a)-rt15/5 b) rt10/5 c) -rt6/3 How do you...
*Sunday, January 1, 2012 at 6:16pm*

**trig**

for the equation 4 cos alpha - square root 12 = 0
*Saturday, December 31, 2011 at 12:50am*

**trig**

differenthate sin8x from first principle?
*Thursday, December 29, 2011 at 5:40am*

**Trig**

If sinx = 1/4 Find the exact value of cos2x I used the formula for double angle identities : cos2x = 1-2sin^2x and got the answer 1/2 The book says the answer is 7/8 How would they get to that conclusion?
*Tuesday, December 27, 2011 at 8:53pm*

**Trig**

If tanx = 2/3 tany = 1/2 then tan(x-y) = ?? a.7/4 b.7/6 c.1/8 d.8/6 which answer is correct ??
*Tuesday, December 27, 2011 at 6:42pm*

**Trig**

sin45cos25 + cos45sin25 = ?? a. cos70 b. sin70 c. cos20 d. sin 20 which answer is correct ??
*Tuesday, December 27, 2011 at 6:39pm*

**Trig**

cos45cos25 - sin 45sin25 = ?? a. cos70 b. sin70 c. cos 20 d. sin 20 which answer is correct ?
*Tuesday, December 27, 2011 at 6:37pm*

**trig**

Matt has a large family when looking at the dates of their birthdays, he noticed that every prime day had at least one birthday. this was also true for perfect squares cubes and multiples of 3,5,7, and 11. what days (1 to 31) are not represented
*Tuesday, December 27, 2011 at 10:37am*

**Trig**

Use reduction identities to determine if the following statement is true or false: tan (A-B) = tan (B-A) Is this starement True or False ?
*Thursday, December 22, 2011 at 10:56pm*

**Trig**

Rewrite tan 88 deg in terms of its cofunction How does that end up????
*Thursday, December 22, 2011 at 10:52pm*

**I have a question concerning Spring Semester**

Im a freshman in college and I just took Chem1, Trig, and Drama (12units). I am planning on taking Chem2, Pre-Calc, and Art1 for spring sem. (13units). I'm not sure if this is too much to take for next semester considering two five unit classes or should I add another ...
*Thursday, December 22, 2011 at 8:53pm*

**Trig**

3. In the figure below, the perimeter of the parallelogram ABCD is (6a + 8b + 29) and the perimeter of the triangle ACD is (3a + 4b + 32). What is the length of AC
*Wednesday, December 21, 2011 at 11:26am*

**Solving trig functions! urgent please help!**

1.2sinxtanx + tanx-2sinx-1=0 2.6tan^2x-4sin^2x=1 Both functions is for 0<x<2pi thank you!
*Tuesday, December 20, 2011 at 11:57pm*

**Trig**

cot (tan + cot) = ?
*Tuesday, December 20, 2011 at 9:57pm*

**Trig**

( sec -1 )(sec +1 ) = ?
*Tuesday, December 20, 2011 at 9:56pm*

**Trig**

sin/tan = ?
*Tuesday, December 20, 2011 at 9:55pm*

**Trig - Thanks Damon and Lindsey**

Thanks a bunch
*Tuesday, December 20, 2011 at 8:32pm*

**trig**

The cross section of a television antenna dish is a parabola. A dish has a receiver that is located at the focus, 4 ft. above the vertex. Find the equation. (which I did) -- x^2 = 8y If the dish is 8 feet wide, how deep is it?
*Tuesday, December 20, 2011 at 8:19pm*

**Trig**

If sin = 2/3 and is a second quadrant angle, determine the exact value of sec^2 could be a. 5/9 b. root5/3 c. 9/4 d. 9/5 Please help.......
*Tuesday, December 20, 2011 at 8:16pm*

**trig**

You are sky diving and are trying to land on a target with a radius of 15 m. You land 10 m west and 10 m north of the center of the target. a. Write an inequality to describe the region inside the target area. b. Do you land within the target area? c. If another skydiver lands...
*Tuesday, December 20, 2011 at 6:16pm*

**trig**

cot^5 x = cot x/sec^4 x - 2 sec^2 x +1
*Monday, December 19, 2011 at 11:06pm*

**trig**

find the exact value of sin(u+v) given that sin u=3/5 and sin v= 15/17
*Sunday, December 18, 2011 at 11:20pm*

**trig**

Solve the following equation for È <= È <= 2(pi) 2 tan È + 3 = tan È
*Sunday, December 18, 2011 at 8:20pm*

**trig math**

Prove that tan(theta)tan(60+theta)=tan3theta
*Saturday, December 17, 2011 at 9:06pm*

**Trig**

The next two steps in solving this trig identity question are ??? 1/csctheta x costheta x sintheta x sectheta = sinsqtheta arghhh need help please
*Saturday, December 17, 2011 at 7:43pm*

**Trig**

Prove the equation is an identity : csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta wow ... try that one
*Saturday, December 17, 2011 at 6:50pm*

**Trig**

Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??
*Saturday, December 17, 2011 at 6:47pm*

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. Don
*Saturday, December 17, 2011 at 5:12pm*

**Trig**

Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities
*Saturday, December 17, 2011 at 4:35pm*

**Trig**

Column 1 Column 2 sec theta - cos theta tan theta sin theta Question: how do you get column 1 to be the same as column 2 ?? using the eight fundamental identities
*Saturday, December 17, 2011 at 4:32pm*

**Trig**

Please disregard last question .... wrote it down wrong .. Thanks
*Saturday, December 17, 2011 at 1:53pm*

**Trig**

Eight Fundamental Identities Sec thada - Cos thada How do I do this?
*Saturday, December 17, 2011 at 1:49pm*

**trig (pre-cal class)**

Suppose è is an acute angle of a right triangle. For this function, find the values of the remaining five trigonometric functions of è. Round to four decimal places. sin è = 0.1 cos è = tan è = cot è = csc è = sec è =
*Thursday, December 15, 2011 at 7:28pm*

**trig**

How do you find 2.8 revolutions per second in radians? I understand that two revolutions would be equal to 4pie but how do you find the 0.8?
*Wednesday, December 14, 2011 at 9:02pm*

**trig**

A force of 50 pounds acts on an object at an angle of 45°. A second force of 75 pounds acts on the object at an angle of -30°. Find the direction and magnitude of the resultant force.
*Wednesday, December 14, 2011 at 8:33pm*

**trig**

A bolt secured to a bridge is being acted upon by forces being exerted by two cables attached to the bolt. The force vector for one of the cables is represented by F1 = <1.7,9.8>. The other force vector, F2, is known to have a magnitude 5 and a direction angle of 10 ...
*Wednesday, December 14, 2011 at 7:30pm*

**trig**

SinA =0.5 cosA=?
*Wednesday, December 14, 2011 at 9:00am*

**trig**

Find ALL solutions to the equation on the interval [0, 2pie]: 2sin(1/2X) = 1
*Wednesday, December 14, 2011 at 12:02am*

**trig**

Find the exact values of the inverse function arcsin 1/2
*Tuesday, December 13, 2011 at 11:06pm*

**trig**

A tree casts a shadow 203 feet long. Find the number of feet in the height of the tree knowing that the angle of elevation of the sun is 16 degrees. Give your answer to the nearest integer. a. 57 b. 56 c. 61 d. 58 e. 55
*Tuesday, December 13, 2011 at 7:31pm*

**Trig**

The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that is(are) in the interval (0,π/2) is one of following a. {π/6} b. {π/3} c. {π/4} d. {π/3, π/6} e. {π/6, π/4}
*Tuesday, December 13, 2011 at 7:19pm*

**Trig**

In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A
*Tuesday, December 13, 2011 at 6:45pm*

**Trig**

How do you find cosine, tangent, and cotangent periods?
*Tuesday, December 13, 2011 at 6:38pm*

**Trig**

Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above
*Tuesday, December 13, 2011 at 6:24pm*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx
*Tuesday, December 13, 2011 at 6:03pm*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx
*Tuesday, December 13, 2011 at 6:03pm*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. ...
*Tuesday, December 13, 2011 at 10:49am*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. M...
*Tuesday, December 13, 2011 at 12:31am*

**Math - Trig**

For the equation 4 cos theta - square root 12 = 0, where 0 < theta < (or equal to) 2 pi, determine the measure of theta. The answers to choose from are: A) pi/ 3, 5 pi/ 3 B) 2 pi/ 3, 4 pi/ 3 C) 5 pi/ 6, 7 pi/ 6 D) pi/ 6, 11 pi/ 6 Please explain and show work, because I ...
*Monday, December 12, 2011 at 2:36pm*

**trig**

Find the exact value of the trigonometric function. -cot(pi/4 + 16pi)
*Monday, December 12, 2011 at 8:59am*

**trig**

How do you evaluate the expression cos3pi
*Sunday, December 11, 2011 at 10:14pm*

**trig**

A satellite is in geostationary orbit 22,500 miles above the earth. IF the radius of the earth is 3,960 miles, how fast is the satellite moving in miles per day? How fast is the satellite moving in miles per hour?
*Sunday, December 11, 2011 at 8:02pm*

**Math**

Trying to understand an inverse trig function. Evaluate Cos^-1 (sqr3/2) So I know it's 30 degrees, but wouldn't it also be 150 degrees because the Arc-cos is defined in the 2nd quadrant?
*Sunday, December 11, 2011 at 6:12pm*

**trig**

Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0
*Sunday, December 11, 2011 at 4:49pm*

**trig**

How do I solve.... Tan 2(theta) - Cos 4(theta) = 0 Domain: (0-360 degrees) Thank you.
*Sunday, December 11, 2011 at 4:35pm*

**Math: Trig**

to determine the height of a pole across a road, Justin takes two measurments. he stands at Point A directly across from the bass of the pole and determines that the angle of elevation to the top of the pole is 15.3 degrees. he then walks 30m parallel to the freeway to point C...
*Sunday, December 11, 2011 at 4:00pm*

**trig**

How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5
*Saturday, December 10, 2011 at 9:22pm*

**trig **

The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller whose aircraft whose engine is expected to run at a maximum of 2800 rpm
*Saturday, December 10, 2011 at 8:09pm*

**trig**

If θ is an angle in standard position and its terminal side passes through the point (20,-21), find the exact value of sec(θ).
*Friday, December 9, 2011 at 11:36am*

**trig**

If (cosa-sina)/sina = 2 , then what is tga = ?
*Friday, December 9, 2011 at 11:21am*

**trig**

find an expression equivalent to sec theta sin theta cot theta csc theta
*Thursday, December 8, 2011 at 7:57pm*

**Math- Trig**

In an oblique triangle ABC, A=30 degree, and the perpendicular from C to AB is 12 inches long. Find the length of AB.
*Thursday, December 8, 2011 at 3:02pm*

**trig**

Prove that the statement is an identity: (tanx/cscx)=(1/cosx)-cosx
*Wednesday, December 7, 2011 at 10:31pm*

**trig**

tan theta= -4/3 and sec theta<0 find sin (theta = pi/6)
*Wednesday, December 7, 2011 at 7:39pm*

**Trig**

1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...
*Wednesday, December 7, 2011 at 5:55pm*

**trig**

simplify: (2sin(2pie/7))/(3cos(3pie/14)
*Wednesday, December 7, 2011 at 2:52pm*

**trig**

I need to prove parallelogram law using the law of cosines. 2AB^2 + 2BC^2 = AC^2 + BD^2 Please, help me to do this.
*Wednesday, December 7, 2011 at 12:18pm*

**trig**

Cos 3 alpha = - 0.1 solutions in degree
*Wednesday, December 7, 2011 at 12:07pm*

**trig**

a right triangle contains a 25 angle. if me leg is of length 5 inches what is the length of the hypotenuse
*Wednesday, December 7, 2011 at 11:50am*

**trig**

CosA*Cos17=1 then determine A
*Wednesday, December 7, 2011 at 6:51am*

**Trig**

Sec (23π/6)
*Tuesday, December 6, 2011 at 4:25pm*

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