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April 23, 2014

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

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trig
Find all angles in degrees that satisfy the equation. Round approximate answers to the nearest tenth of a degree. tan α = -1.85
Monday, June 17, 2013 at 12:58am

trig
cos A = 1 / 3 sin A = + OR - sqrt ( 1 - cos A ^ 2 ) sin A = + OR - sqrt ( 1 - ( 1 / 3 ) ^ 2 ) sin A = + OR - sqrt ( 1 - 1 / 9 ) sin A = + OR - sqrt ( 9 / 9 - 1 / 9 ) sin A = + OR - sqrt ( 8 / 9 ) sin A = + OR - sqrt ( 4 * 2 / 9 ) sin A = + OR - sqrt ( 4 ) * sqrt ( 2 ) / sqrt...
Monday, June 17, 2013 at 12:42am

trig
Use a sum or difference identity to find the exact value. tan 25deg + tan 5deg / 1-tan 25deg tan 5deg
Monday, June 17, 2013 at 12:40am

trig
Find cos(A+B). cos A=1/3 and sin B=-1/2, with A in quadrant I and B in quadrant IV.
Sunday, June 16, 2013 at 11:20pm

trig
Since (5,12,13) is a Pythagorean triplet, tan(θ)=5/12. Mathematically, we solve it by: Divide by the right hand side: (5/13)sin(θ)+(12/13)cos(θ)=1​ Since (5/13)²+(12/13)²=1, we can put 5/13=sin(φ) 12/13=cos(φ) so sin(φ)sin(&theta...
Saturday, June 15, 2013 at 11:03am

trig
if 5sin theta + 12cos theta is equal to 13 find the value of tan theta
Saturday, June 15, 2013 at 8:41am

trig
Sin < 0-----> quadrant 3 and 4 Sec > 0 ---- quadrant 1 and 4 sec = 1/cos Answer is quadrant 4
Friday, June 14, 2013 at 6:30pm

Algebra 3 and trig
distance is √(177^2 + 265^2) bearing is (90-θ) where tanθ = -265/177
Thursday, June 13, 2013 at 5:28am

Algebra 3 and trig
An ocean liner is 177 miles due west of lighthouse A. Lighthouse B is 265 miles due south of lighthouse A. Find the distance from lighthouse B to the liner and the bearing of the ocean liner from lighthouse B.
Wednesday, June 12, 2013 at 6:22pm

trig
sin negative, cosine positive? sin is negative III, IV cosine positive I, III
Wednesday, June 12, 2013 at 3:27pm

trig
quadrant 1
Wednesday, June 12, 2013 at 3:19pm

trig
for the given angle, name the quadrant in whihc the terminal side lies. -350deg
Wednesday, June 12, 2013 at 2:25pm

trig
identify the quadrant in which 0 lies. sin < 0 and sec > 0
Wednesday, June 12, 2013 at 2:02pm

trig
determine the period of the function. y = cot 4t
Wednesday, June 12, 2013 at 1:26pm

trig
for (-3,4) x = -3, y = 4 cotØ = x/y = - 3/4
Tuesday, June 11, 2013 at 8:12pm

trig
cosØ = x/r = 2/7 so x=2 , r = 7 2^2 + y^2 = 7^2 y^2 = 45 = ± 3√5 but we are in IV , so y = -3√5 sinØ = -3√5/7
Tuesday, June 11, 2013 at 8:11pm

trig
sin positive, quad I and II Tan negative, Quad II, IV Quad II
Tuesday, June 11, 2013 at 8:04pm

trig
Identify the quadrant in which θ lies. sin > 0 and tan < 0
Tuesday, June 11, 2013 at 7:59pm

trig
Find the trigonometric function value of angle θ. Cos θ = 2/7 and θ is in quadrant IV. Find sin θ.
Tuesday, June 11, 2013 at 7:30pm

trig
The point (-3, 4) is on the terminal side of angle θ in standard position. Find cot θ.
Tuesday, June 11, 2013 at 7:24pm

trig
angular velocity: 1st wheel : 2π rad/30 sec = π/15 rad/sec 2nd wheel : 2π radians/15 sec = 2π/15 rad/sec linear velocity 1st wheel: circumference = 2π(20) = 40π ft linear velocity = 40π/30 ft/sec = 4π/3 ft/se 2nd wheel: circumf = 20π...
Tuesday, June 11, 2013 at 6:42pm

trig
construct your triangle in the third quadrant, using Pythagoras, you know r^2 = (-2)^2 + (-3)^2 = 13 r = √13 then cosØ = x/r = -2/√13 , then sec Ø = -√13/2
Tuesday, June 11, 2013 at 6:37pm

trig
Given that θ is an angle in standard position whose terminal side contains the given point, provide the exact value of the indicated function. (-2, -3) Find sec θ.
Tuesday, June 11, 2013 at 4:31pm

trig
ferris wheel one has a 40ft diameter, revolves once every 30 seconds and is 5ft above ground. Ferris wheel two has a diameter of 20feet, revolves once every 15seconds and is 2 feet above the ground. each angular velocity?? each linear velocity??
Tuesday, June 11, 2013 at 3:26pm

math - trig
You know that sinØ = y/r cosØ = x/r tanØ = y/x cscØ = r/y etc so in any point the first coordinate is the x, the 2nd is the y 1. for (-12, -5) you would be in quadrant III x = -12, y = -5 use Pythagoras, x^2 + y^2 = r^2 ( where we keep r always ...
Tuesday, June 11, 2013 at 8:52am

math - trig
1. Find csc A, cos A and tan A of an angle A whose terminal side contains (– 12, – 5). 2. Find sin X, sec X and cot X of an angle X whose terminal side contains (– 3, 5).
Tuesday, June 11, 2013 at 4:11am

Trig
I get 252.717 or 253
Monday, June 10, 2013 at 11:36pm

Trig
I got 263.
Monday, June 10, 2013 at 8:55pm

Trig
did you make a sketch? I have , top of tower -- P , bottom of tower Q closer point A farther point B In triangle PBA angle B = 29°5' angle BAP = 142°55' angle BPA = 8° AB = 120 by sine law: PA/sin 29°5' = 120/sin 8° PA = 419.1165 now triangle ...
Monday, June 10, 2013 at 8:29pm

Trig
The angle of elevation from a point on the ground to the top of a tower is 37deg5'. The angle of elevation from a point 120 feet farther back from the tower is 29deg5'. Find the height of the tower (to the nearest foot).
Monday, June 10, 2013 at 7:06pm

Math Help
Permutation and combinations (Trig/alg2 class) In how many ways can all the letters in SEYCHELLES be arranged?
Sunday, June 9, 2013 at 11:51pm

Trig
Oops. 11pi/9 > pi, so subtract pi to get 2pi/9 play around adding and subtracting 2pi or pi till you get an angle in QI.
Sunday, June 9, 2013 at 5:17pm

Trig
-7pi/9 + 2pi = 11pi/9 This is in QII, so we need to subtract it from pi: pi - 11pi/9 = 7pi/9 You can also subtract 2pi if the angle is large and positive.
Sunday, June 9, 2013 at 5:15pm

MATH -
Permutation and combinations (Trig/alg2 class) In how many ways can all the letters in SEYCHELLES be arranged?
Sunday, June 9, 2013 at 2:52pm

Trig
Find the reference angle θ'. θ= -7pi/9
Saturday, June 8, 2013 at 11:55pm

Math Trig Find Quadrant I II III IV
Think of degrees if radians give you trouble π radians = 180° so (-5/6)π radians = -(5/6)(180)° = -150° so going clockwise 150° would put you into quadrant III
Saturday, June 8, 2013 at 11:18pm

Trig
A = 1/2r^2 θ A = 1/2(6)^2(pi/2) A = 1/2(36)(pi/2) A = 9pi cm^2
Saturday, June 8, 2013 at 11:17pm

Trig
Find the area of a sector with the given central angle θ in a circle of radius r. θ = 90°, r = 6 cm
Saturday, June 8, 2013 at 11:03pm

Math Trig Find Quadrant I II III IV
In which quadrant is the terminal side of angle A? A = -5π/6 a. Quadrant III b. Quadrant I c. Quadrant II d. Quadrant IV
Saturday, June 8, 2013 at 10:49pm

Math
on all these, they are the same thing. I am not certain how you see 4,5 as different. look here: http://www.sosmath.com/trig/Trig5/trig5/​trig5.html Print that out. Notice the sum to product formulas. If you were my student, I would have you write each formula on a flash...
Monday, June 3, 2013 at 9:12pm

Trig
try doing it ur self
Monday, June 3, 2013 at 8:45pm

trig
Then recall that tanx >0 in QI,QIII
Friday, May 31, 2013 at 11:06am

trig
tanx - √3 = 0 tanx = √3 At this point it helps to have memorized the trig ratios for the few angles where at least one of them is rational. In this case, recall that sin60° = √3/2 cos60° = 1/2 tan60° = √3
Friday, May 31, 2013 at 11:06am

trig
what are the values of the angle in the interval 0<the angle<360 that satisfy the equation tan beta- radical 3=o
Thursday, May 30, 2013 at 10:57pm

trig
using x to avoid copy/paste of ø, m sinx + 2sinx + 2m cosx - cos x = 2m+1 (sinx + 2cosx)m + (2sinx - cosx) = 2m+1 If these are identical, then sinx + 2cosx = 2 2sinx - cosx = 1 sinx = 4/5 cosx = 3/5 tanx = 4/3
Wednesday, May 29, 2013 at 10:46am

trig
If (m+2)sin ø + (2m-1)cos ø = 2m+1 then tan ø is equal to
Wednesday, May 29, 2013 at 2:54am

Math-Trig
the velocity has two components: x: 36 cos70° = 12.31 y: 36 sin70° = 33.83 now recall that the x-speed is constant, and the height y = 33.8t - 16t^2 now solve for the various requirements
Tuesday, May 28, 2013 at 2:50pm

Math-Trig
A ball is tossed up in the air at an angle of 70 degrees with the horizontal and with an initial velocity of 36 ft/sec. What is the position of the ball 1 second after it is released? When will the ball hit the ground? What is the maximum height the ball will reach? How far in...
Tuesday, May 28, 2013 at 2:47pm

trig
My sketch is a triangle with sides 16, 24 and 28 , and I am looking for the angle Ø opposite the 28 by cosine law 28^2 = 16^2+24^2 - 2(16)(24)cosØ 768cosØ = 48 cosØ = 48/76 Ø = 50.8°
Monday, May 27, 2013 at 8:23am

trig
A security camera needs to be set so that the angle of view includes the area from a doorway to the edge of a parking lot.The doorway is 16m from the camera. the edge of the parking lot is 24m for the camera. the doorway is 28m from the edge of the parking lot. what angle of ...
Monday, May 27, 2013 at 12:49am

trig
in the diagram below.A,B and C are three points in the same horizontal plane and AD is a vertical tower.AC=AB=x and DC=DB.the angle of elevetion of D from C is alpha and DB^C=theta 1.express DC in terms of x trigonometry value of alpha 2.prove that BC=2xcostheta/cos alpha
Sunday, May 26, 2013 at 10:54am

trig
please am stucked help me.in the diagram below.A,B and C are three points in the same horizontal plane and DC is a vertical tower.AC=AB=x and D^C=DB.the angle of elevation of D from C is alpha and DB^C=theta
Sunday, May 26, 2013 at 7:31am

How to get quick responses to your math questions
Math is a wide subject, ranging from K to 11, college and university. Then there is algebra, trigonometry, geometry, arithmetic, calculus, number theory, ... etc. Not all teachers answer all math questions (many do). If you would give a little more detail on which branch of ...
Saturday, May 25, 2013 at 9:45am

trig
So on the Cartesian plane, it is in the fourth quadrant, with x-y as (900,-500). Atan(-500/900)= -29° approximately. So the bearing is S61°E.
Saturday, May 25, 2013 at 6:25am

trig
A hiker walks 900m east and 500m south .Find the bearing of the finishing position from the staring point?
Saturday, May 25, 2013 at 3:44am

trig
you are exactly right tan(4x) = 2tan2x/(1-tan^2(2x)) so, cot(4x) is the reciprocal, as needed.
Thursday, May 23, 2013 at 3:17pm

trig
okay, thank you, would that still apply if it was cot4x=1-tan^2(2x)/2tan2x? because ive got the right side for this one but the cot4x is throwing me off, how would you solve that side?
Thursday, May 23, 2013 at 3:13pm

trig
just apply the double-angle formula for tan(2x) and take the reciprocal
Thursday, May 23, 2013 at 3:02pm

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

TRIG Help help help test tommarow
(h+1250)/1150 = tan 52°
Thursday, May 23, 2013 at 10:28am

TRIG Help help help test tommarow
A TV tower stands on top of the Empire State building. From a point (on the ground) 1150 feet from the base of the building, the angle of elevation to the top of the TV tower is 52 degrees. If the building is 1250 feet tall, what is the length of the TV tower?
Wednesday, May 22, 2013 at 6:48pm

Applied Physics
what is 40Sin65? This is physics? Most folks would call this basic trig functions.
Monday, May 20, 2013 at 5:05pm

Mathematics Ms Sue help
for the building, h/18 = tan 88° for the boat, d/40 = sin 65° for stuff like this, it always helps to draw a diagram, then dig into your box of trig ratios
Monday, May 20, 2013 at 4:21pm

TRIGONOMETRY
by test time you need to know the "standard" angles with easy-to-recall trig functions 0,π/6,π/4,π/3,π/2 If you know those angles and their trig ratios, you will recall that tan π/3 = √3 Now, recall the bit about principal values of ...
Saturday, May 18, 2013 at 11:47am

TRIGONOMETRY
Can someone please give me a step by step answer on how to find the complex cube roots of 8(cos(4π/5)+isin(4π/5))? I need to know how to do this for my trig final next week.
Friday, May 17, 2013 at 5:01pm

TRIGONOMETRY
I don't understand how to convert -3-4i to polar coordinates. I need to know how so I am ready for my trig final next year. Can someone please show me step by step how to solve this? Thanks
Friday, May 17, 2013 at 3:31pm

TRIGONOMETRY
Can someone please show me step by step how to calculate the modulus and the argument for these complex numbers? I have a trig final next week and I am trying to finish this study guide so I am prepared. Thank you so much! If you can, please show my how you get the answer so I...
Friday, May 17, 2013 at 9:11am

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each ...
Thursday, May 16, 2013 at 11:29am

TRIGONOMETRY
Can you check my work, please? This is for a trig study guide for my final next week. I'd like to know if I'm doing this right. :) 2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) ...
Thursday, May 16, 2013 at 11:26am

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
Thursday, May 16, 2013 at 11:13am

trig
sinx cosy(cotx tany-1) sinx cosy cosx/sinx siny/cosy - sinx cosy cosx siny - sinx cosy sin(y-x)
Wednesday, May 15, 2013 at 2:50pm

trig
Sinxcosy(cotxtany-1)
Wednesday, May 15, 2013 at 12:16pm

trig
Sinxcosy(cotxtany-1)
Wednesday, May 15, 2013 at 12:15pm

trig
There are 15,000 endive lettuce seeds in an ounce and 300 seeds in a packet. The seeds cost $1.50 per packet. What is the cost, in dollars, of one ounce of seeds?
Wednesday, May 15, 2013 at 10:04am

trig
5cosA+3 = 0 means that cosA = -3/5 So, A is in QIII sinA = y/r = -4/5 sinA+cosA = -4/5 + -3/5 = -7/5 tanA*sinA = 4/3 * -4/5 = -16/15
Monday, May 13, 2013 at 12:08pm

trig
if 5cos A plus 3=0 and 180<A<360..without using a calculator and with the aid of a diagram,determine the value of 1.1 sinA plus cosA 1.2 tanA *sinA
Monday, May 13, 2013 at 11:52am

Trig
4x+y = 84, so y = 84-4x v = x^2 y = x^2(84-4x) = 84x^2 - 4x^3 dv/dx = 168x - 12x^2 = 12x(14-x) dv/dx=0 when x=14 so the box is 14 x 14 x 28
Sunday, May 12, 2013 at 11:53pm

Trig
The postal service places a limit of 84 inches on the combined lenght and girth (distance around) of a package to be sen parcel post. What Dimensions of a rectangular box with square cross-section will contain the largest volume that can be mailed?
Sunday, May 12, 2013 at 11:32pm

TRIG
term(n) = a + (n-1)d 428 = 4 + (n-1)(8) 424 = 8n - 8 432 = 8n n = 54 Draw your conclusion
Sunday, May 12, 2013 at 12:12am

TRIG
Did you notice that there is a "common difference" of 4 ? so term (n) = .....
Sunday, May 12, 2013 at 12:10am

TRIG
exactly what don't you understand about this question a = 2 d = 2 n = 100 Sum(100) = .... just use your formula
Sunday, May 12, 2013 at 12:08am

TRIG
pop = 1.3(1.04)^8 = ..... million
Sunday, May 12, 2013 at 12:07am

TRIG
term(6) = ar^5 = (-5)(2.5)^5 = -488.28125
Saturday, May 11, 2013 at 11:52pm

TRIG
in an arithmetic sequence a1=4 and d=8 which term is 428 Show your work
Saturday, May 11, 2013 at 8:32pm

TRIG
what is the explicit formula for the sequence 3,7,11,15
Saturday, May 11, 2013 at 8:30pm

TRIG
determine the sum of the first 100 even integers SHOW YOUR WORK
Saturday, May 11, 2013 at 8:29pm

TRIG
the population of a certain city is 1.3 million people. if the population is growing at the rate of 4% per year what will the population be in 8 years
Saturday, May 11, 2013 at 8:28pm

TRIG
What is the 6th term of the geometric series with a1= -5 and r=2.5
Saturday, May 11, 2013 at 8:25pm

trig
cos(a+b)/sin(a+b)= cosacosb+sinasinb/sinacosb-cosasinb multiplying and dividing by sinasins then it becomes cotacotb+1/cotb-cota
Saturday, May 11, 2013 at 12:02pm

trig identites
since sin(n*180) = 0, 2x+60 = n*180 x = n*90 - 30
Friday, May 10, 2013 at 11:48pm

trig identites
since sin2x+√3cos2x=2sin(2x+60) find the general solution for the equation sin2x+√3cosx=0 thank you
Friday, May 10, 2013 at 7:35pm

math
simplify sin(540-2x) this is to do with trig
Friday, May 10, 2013 at 10:13am

Trig
recall that (a-b)(a+b) = a^2-b^2 sec^2(x) - 1 = tan^2(x) put the fractions over a common denominator and watch the answer fall out.
Thursday, May 9, 2013 at 2:43pm

Trig
Verify the identity. (secx + tanx)/(secx - tanx) = (1 + 2sinx + sin(^2)x)/cos(^2)x
Thursday, May 9, 2013 at 2:16pm

Trig
Verify the identity. 1/(tanx-secx) + 1/(tanx+secx) = -2tanx
Thursday, May 9, 2013 at 1:54pm

math trig
I will do of these, for 135° : assume the axle is 20.5 above the ground height above axle: sin135 = h/20.5 h = 20.5sin135 = appr 14.5 m so height above the ground = 20.5 + 14.5 = 35 for 315° height from axle : sin 315 = h/20.5 h = 20.5sin135 = appr - 14.5 notice the ...
Thursday, May 9, 2013 at 12:33pm

math trig
sin45 = height/20.5 height = 20.5sin45 = 14.4 m above the axle
Thursday, May 9, 2013 at 12:20pm

math trig
If a ferris wheel with a 20.5 meter radius, how high would one car be from the loding dock at these given angles trveled by the rider?: 90 135 180 225 270 315 405 450 495 and 540?
Thursday, May 9, 2013 at 10:40am

math trig
If a ferris wheel has a radius of 20.5meters, how tall would a 45 degree angle be?
Thursday, May 9, 2013 at 10:28am

Honors Trig
From the diagram that you made, let the speed of the wind be x, we get by the cosine law x^2= 350^2 + 400^2 - 2(350)(400)cos10° = 6753.829.. x = 82.18 mph by the sine law, the other acute angle Ø is .... sinØ/350 = sin10/82.18 sinØ = .7395.. Ø...
Wednesday, May 8, 2013 at 7:23pm

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