Thursday

January 19, 2017
**Trigonometry**

What are these things called: -cos x = cos -x What are the rules to these trig rules? Thanks

*Sunday, January 22, 2012 by Trigonometry*

**trig**

4cos^2 theta = 3 where 0 degrees < theta< 360

*Sunday, January 22, 2012 by valeria hersh*

**alg2/trig**

1)3x^2-12x-21 solve by completing the square in simplest radical form 2) (1/x+3)-(2/3-x)=(4/x^2-9)find values of x 3)3/radical(3a^2b^4) is equivalent to 4) factor completely 27x^-75x^4

*Sunday, January 22, 2012 by alice*

**trig**

Please explain to me how to get this -- what quadrant tan theta < 0, sin theta < 0 is in.

*Saturday, January 21, 2012 by Jen*

**Trig**

what quadrant is this in and please explain... sin theta < 0, cos theta > 0

*Saturday, January 21, 2012 by Jen*

**trig**

5pi/7 what quadrant is it in???

*Saturday, January 21, 2012 by Jen*

**Trig**

Find the speed in both radians per second and degrees per second for the hour hand, the minute hand, and the second hand on a clock.

*Saturday, January 21, 2012 by Al B.*

**algebra 2 trig**

express the product of (2/3x^2-1/2x) and (12x+4/5) as a trinomial

*Saturday, January 21, 2012 by ally*

**trig**

How to get 5degree without using calculator using identities?

*Friday, January 20, 2012 by Laurnece*

**trig**

if you are riding on a ferris wheel that is 60 ft tall and it takes you 5 minutes to make 1 revolution, what is your linear velocity?

*Friday, January 20, 2012 by Destiny*

**Math**

Would someone verify these answers. 1. A person waves his hand back and forth, where their finger tips move past the starting position 4 cm in each direction. If he waves 20 times every 15s, what sine equation models the movement of the hand if the hand starts in the upright ...

*Thursday, January 19, 2012 by Melinda*

**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 by Claire*

**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 by Claire*

**trig**

If theta =( -7pi )/( 3) , then sec(theta) equals...?

*Tuesday, January 17, 2012 by Andreana*

**trig**

How do I get exact measures? cosine 270 degrees sin 90 degrees tan 360 degrees csc 45 degrees no calculator!

*Monday, January 16, 2012 by lola*

**trig**

how do I find this without a calculator? sin 90 degrees?

*Monday, January 16, 2012 by lola*

**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 by lola*

**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 by lola*

**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 by Don*

**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 by Grail*

**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 by Angela P.*

**trig**

3x^2+16y^2=48 conic sections

*Friday, January 13, 2012 by Anonymous*

**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 by Anna*

**Trig**

IfA=340Â°, prove that 2cosA/2 = -(v1+sinA) - (v1-sinA)

*Thursday, January 12, 2012 by Kewal*

**trig**

evaluate sin (11pi/6) to the nearest thousandth.

*Wednesday, January 11, 2012 by Rachel*

**trig**

write sec theta in terms of sin theta when theta lies in quadrant III

*Wednesday, January 11, 2012 by Bonnie*

**trig**

what is the amplitude of y=2+cos(-1/2 theta)?

*Tuesday, January 10, 2012 by Tyrone*

**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 by Don*

**Trig**

(sin/cos)/ ( 1/cos - 1) = I'm stumped

*Sunday, January 8, 2012 by Don*

**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 by Don*

**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 by Kenneth*

**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 by Abbey*

**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 by luckybee*

**trig**

express 4/5-radical 13

*Thursday, January 5, 2012 by challenger *

**trig**

express 4/5-ÂÃ£13 plz

*Thursday, January 5, 2012 by challenger *

**trig**

express 4/5-ÂÃ£13 plz

*Thursday, January 5, 2012 by challenger *

**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 by Don*

**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 by Don*

**Trig**

The radius of: (x+2)^2 + (y-3)^2 =9 is 3 is this correct?

*Wednesday, January 4, 2012 by Don*

**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 by Don*

**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 by brittney *

**trig**

prove that tan^2x+ sec^2x =1

*Tuesday, January 3, 2012 by Cindy*

**Trig**

Prove that 1 + tanAtanA/2 = tanAcotA/2 -1 = secA

*Tuesday, January 3, 2012 by Kewal*

**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 by Don*

**Trig**

sinAsin2A+sin3Asin6A+sin4Asin13A/sinAcos2A+sin3Acos6A+sin4Acos13A = tan9A

*Monday, January 2, 2012 by Kewal*

**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 by Don*

**trig**

for the equation 4 cos alpha - square root 12 = 0

*Saturday, December 31, 2011 by Anonymous*

**trig**

differenthate sin8x from first principle?

*Thursday, December 29, 2011 by masood*

**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 by Don*

**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 by Don*

**Trig**

sin45cos25 + cos45sin25 = ?? a. cos70 b. sin70 c. cos20 d. sin 20 which answer is correct ??

*Tuesday, December 27, 2011 by Don*

**Trig**

cos45cos25 - sin 45sin25 = ?? a. cos70 b. sin70 c. cos 20 d. sin 20 which answer is correct ?

*Tuesday, December 27, 2011 by Don*

**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 by Anonymous*

**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 by Don*

**Trig**

Rewrite tan 88 deg in terms of its cofunction How does that end up????

*Thursday, December 22, 2011 by Don*

**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 by L.Bianchessi*

**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 by Keaton*

**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 by Sally*

**Trig**

cot (tan + cot) = ?

*Tuesday, December 20, 2011 by Don*

**Trig**

( sec -1 )(sec +1 ) = ?

*Tuesday, December 20, 2011 by Don*

**Trig**

sin/tan = ?

*Tuesday, December 20, 2011 by Don*

**Trig - Thanks Damon and Lindsey**

Thanks a bunch

*Tuesday, December 20, 2011 by Don*

**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 by lindsey*

**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 by Don*

**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 by Elle*

**trig**

cot^5 x = cot x/sec^4 x - 2 sec^2 x +1

*Monday, December 19, 2011 by tiara*

**trig**

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

*Sunday, December 18, 2011 by k*

**trig**

Solve the following equation for Ãˆ <= Ãˆ <= 2(pi) 2 tan Ãˆ + 3 = tan Ãˆ

*Sunday, December 18, 2011 by Anonymous*

**trig math**

Prove that tan(theta)tan(60+theta)=tan3theta

*Saturday, December 17, 2011 by Rajesh kumar*

**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 by Don*

**Trig**

Prove the equation is an identity : csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta wow ... try that one

*Saturday, December 17, 2011 by Don*

**Trig**

Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??

*Saturday, December 17, 2011 by Don*

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. Don

*Saturday, December 17, 2011 by Don*

**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 by Don*

**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 by Don*

**Trig**

Please disregard last question .... wrote it down wrong .. Thanks

*Saturday, December 17, 2011 by Don*

**Trig**

Eight Fundamental Identities Sec thada - Cos thada How do I do this?

*Saturday, December 17, 2011 by Don*

**trig (pre-cal class)**

Suppose Ã¨ is an acute angle of a right triangle. For this function, find the values of the remaining five trigonometric functions of Ã¨. Round to four decimal places. sin Ã¨ = 0.1 cos Ã¨ = tan Ã¨ = cot Ã¨ = csc...

*Thursday, December 15, 2011 by Allison*

**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 by John*

**trig**

A force of 50 pounds acts on an object at an angle of 45Â°. A second force of 75 pounds acts on the object at an angle of -30Â°. Find the direction and magnitude of the resultant force.

*Wednesday, December 14, 2011 by Cam*

**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 by John*

**trig**

SinA =0.5 cosA=?

*Wednesday, December 14, 2011 by Ram*

**trig**

Find ALL solutions to the equation on the interval [0, 2pie]: 2sin(1/2X) = 1

*Wednesday, December 14, 2011 by John*

**trig**

Find the exact values of the inverse function arcsin 1/2

*Tuesday, December 13, 2011 by Nick*

**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 by James B*

**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 by Lenny*

**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 by Carl*

**Trig**

How do you find cosine, tangent, and cotangent periods?

*Tuesday, December 13, 2011 by Dane*

**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 by Carl*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

*Tuesday, December 13, 2011 by Rin*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

*Tuesday, December 13, 2011 by Rin*

**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 by Joesph*

**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 by A*

**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 by Angi *

**trig**

Find the exact value of the trigonometric function. -cot(pi/4 + 16pi)

*Monday, December 12, 2011 by Keenia*

**trig**

How do you evaluate the expression cos3pi

*Sunday, December 11, 2011 by Freckles*

**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 by shawna*

**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 by Bobby*

**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 by Josh*

**trig**

How do I solve.... Tan 2(theta) - Cos 4(theta) = 0 Domain: (0-360 degrees) Thank you.

*Sunday, December 11, 2011 by Heather*