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April 19, 2014

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

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trig
Use the sine law sinA/18 = sin125°/42 sinA = .351065.. A =appr 20.55°
Wednesday, May 16, 2012 at 10:46pm

trig
(csc^2 Ø - 1)/csc^2 Ø = 1 - 1/csc^2 Ø = 1 - sin^2 Ø = cos^2 Ø
Wednesday, May 16, 2012 at 10:43pm

trig
the period of tan kØ is π/k (which is also true for cotangent) so period of -2cot (x/5) is π/(1/5) = 5π
Wednesday, May 16, 2012 at 10:39pm

trig
inverse cos 4/5 = cos^-1 (4/5) = .6435.. then tan^-1 x = .6435... x = tan .6435... = .75 or, make a diagram with sides 3-4-5 then, if tan^-1 x = cos^-1 (4/5) then x = tan (cos^-1(4/5) ) = 3/4 or .75
Wednesday, May 16, 2012 at 10:36pm

trig
1 rotation = 2π radians so the angular velocity at 100 revs/sec = 100(2π) radians/sec = ....
Wednesday, May 16, 2012 at 10:28pm

trig
Cos^2(x) - Sin^2(x) = Cos(2 x) So, you can write the expression as cos(8 theta)
Wednesday, May 16, 2012 at 10:15pm

trig
inverse tan x = inverse cos 4/5
Wednesday, May 16, 2012 at 9:35pm

trig
A wheel rotates at 100 revolutions per second. find the angle velocity in radians per second.
Wednesday, May 16, 2012 at 9:32pm

trig
find the single term of cos^2 4theta - sin^2 4theta
Wednesday, May 16, 2012 at 9:23pm

trig
find the period of f(x)=-2cot x/5
Wednesday, May 16, 2012 at 9:21pm

trig
what is the single term of csc^2 theta-1 over csc^2 theta
Wednesday, May 16, 2012 at 9:15pm

trig
what is the angle of A? C = 125 degrees, a = 18, and c = 42
Wednesday, May 16, 2012 at 9:11pm

trig
84*PI/180
Wednesday, May 16, 2012 at 8:56pm

trig
SA= PI-PI/8= 7PI/8
Wednesday, May 16, 2012 at 8:56pm

trig
find the supplimentary angle of pie over 8
Wednesday, May 16, 2012 at 8:45pm

trig
find the exact radian of 84 degrees
Wednesday, May 16, 2012 at 8:44pm

trig
What is 1/3 ?
Wednesday, May 16, 2012 at 8:44pm

trig
Find the amplitude of f(t)=1/3sin8t
Wednesday, May 16, 2012 at 8:43pm

Trig
Find the eccentricity of the ellipse. x^2+7y^2=35
Wednesday, May 16, 2012 at 7:26pm

trig and combine function
Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...
Wednesday, May 16, 2012 at 6:13pm

trig - correction
bzzt, but thanks for playing 3e^2x=18 e^2x = 6 2x = ln6 x = 1/2 ln6
Wednesday, May 16, 2012 at 4:04pm

trig
thank you
Wednesday, May 16, 2012 at 2:40pm

trig
x=6/e^2
Wednesday, May 16, 2012 at 2:30pm

trig
3e^2x=18
Wednesday, May 16, 2012 at 2:24pm

trig
Here is a standard way to solve these kind of problems, I will do the first one sinx = -.35 , 180 < x <270 1. Find the acute angle, sometimes called the "angle in standard position" by using the positive decimal if sinx = .35, x = 20.5° but x is supposed to...
Tuesday, May 15, 2012 at 9:27pm

trig
solve for the equation x sin x= -.35 180<x<270 sin x= .2 90<x<180 cos x = -.72 180< x<270 please explain, thanks :)
Tuesday, May 15, 2012 at 8:40pm

Trig
1/cos + sin/cos = 1 1 + sin = cos 1 + 2sin + sin^2 = cos^2 = 1 - sin^2 2sin^2 + 2sin = 0 2sin(sin+1) = 0 sin=0 or sin = -1 x = 0, π, 3π/2 but, sec and tan are not defined at 3π/2, and π does not satisfy the original equation, so the solution is 0. so, x = ...
Tuesday, May 15, 2012 at 5:41pm

Trig
Ok i understand how to do these I'm just stuck on this one: secx + tanx = 1
Tuesday, May 15, 2012 at 4:20pm

Pre-Calculus-Trig
2044
Monday, May 14, 2012 at 8:01pm

trig
Here is the page of identities: http://www.trans4mind.com/personal_devel​opment/mathematics/trigonometry/sumProdu​ctCosSin.htm#Products I can not possibly help you on here typing all this. Plan on getting a yellow legal pad and be careful.
Sunday, May 13, 2012 at 9:12pm

trig
2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4​)x)]+x can someone simplify this using trig identities?
Sunday, May 13, 2012 at 9:08pm

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 9:07pm

trig! please help!
What is the question? Is there an equal sign in the above? Are there two variables, t and x?
Sunday, May 13, 2012 at 9:02pm

trig! please help!
2sin(4t)[(cos(3/2)x)(cos(5x/2)-sin((15/4​)x)]+x
Sunday, May 13, 2012 at 8:59pm

trig pre calc
cosx secx=1 cos^2 *csc^2= ctn^2 x 1+ctn^2=csc^2 multipy left by sin^2/sin^2 1/sin^2 (sin^2+cos^2)= csc^2 = csc^2
Sunday, May 13, 2012 at 8:44pm

trig pre calc
cos x (sec x +cos x csc2x)=csc2x
Sunday, May 13, 2012 at 8:16pm

trig
Hmmmm. Wondering if you are taking calculus. Calculus y=sinxcosx y'=0=cos^2x-sin^2x cos^2x=sin^2x tan^2 x=1 tanx= +-1 which occurs at increments of 45 degrees x= +-PI/4, PI+-Pi/4 check that
Sunday, May 13, 2012 at 12:46pm

trig
find the values of x between 0 and 2 pi where the tangent line to the graph of y = sinxcosx is horizontal
Sunday, May 13, 2012 at 10:40am

geom/trig
The base of a right rectanglar prism is 12 cm by 8 cm. The height is 5 cm. Find its surface area.
Friday, May 11, 2012 at 3:39pm

trig
cos ( pi - x )= - cos x
Friday, May 11, 2012 at 2:02pm

trig
cos(π-x)=
Friday, May 11, 2012 at 1:18pm

trig
isn't this a difference of two squares? I assume it all is equal to zero... (1-sqrt2*sin2x)(1+sqrt2*sin2x)=0 solve for 2x, then x.
Thursday, May 10, 2012 at 6:56pm

trig
1-2sin^2(2x)
Thursday, May 10, 2012 at 6:52pm

trig
two dice are rolled, find p(2,then 3)
Thursday, May 10, 2012 at 1:16pm

Trig
(1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X (sin^2 x + cos^2 x - 2sin^2 x)^2 + (2sinxcosx)^2 = (cos^2x - sin^2x)^2 + (sin 2x)^2 = (cos 2x)^2 + (sin 2x)^2 = 1
Monday, May 7, 2012 at 8:19pm

Trig
simplify the expression to a single term: (1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X I'm not sure how to start this or which identities to use. Any suggestions?
Monday, May 7, 2012 at 8:01pm

Trig
I believer picture cards are the K, Q, and J so there are 12 of them prob(3 picture cards of 3 drawn) = (12/52)(11/51)(10/50) = 11/1105
Monday, May 7, 2012 at 7:34pm

Trig
If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.
Monday, May 7, 2012 at 7:22pm

math algebra trig
For all these problems, we only have to complete the squares and transform the equations to the form y=a(x-h)²+k then (h,k) is the vertex. If a>0, the vertex is a minimum, and if a<0, then the vertex is a maximum. a) y=-x²+4x-7 =-1(x-2)²-3 So (h,k)=(2,-3) ...
Sunday, May 6, 2012 at 8:10am

algebra-trig help asap
Write an equation I'm not sure how to do this though. The sine of x with an amplitude of 4, period of 3(pie) and phase shift to the right of pie/4
Saturday, May 5, 2012 at 7:53pm

math algebra trig
For the graph of each function, find an equation of the line of symmetry and the coordinates of the vertex. Tell whether the value of the function at the vertex if a maximum or a minimum: a) y = -x^2 + 4x - 7; b) y = 2x^2 + 4x; c) y = -3x^2 - 18x + 5.
Saturday, May 5, 2012 at 7:42pm

algebra-trig help asap
An isosceles triangle has a base 36 cm long and a base of 65 degrees. Find its perimeter. I'm not sure if this is right but my answer is 1250.4 in^2
Saturday, May 5, 2012 at 6:48pm

PreCalculus (PLEASE HELP, IM BEGGING!)
Can anyone please explain these problems to me?? I really need help!I need to simplify these trig expressions but I don't understand how my teacher is doing it at all and I have a quiz on this tomorrow! I've really been trying but I just don't get it! 1)Mulitply: [...
Saturday, May 5, 2012 at 2:09am

trig
from 5tanx - 12 = 0 tanx = 12/5 make a sketch of a right-angled triangle, in quad I where x is the angle at the origin, the other acute angle is y the hypotenuse would be 13 , from the 5-12-13 right-angled triangle then 2sin^2 x + cosy = 2(12^2 / 13^2) + 12/13 = 288/169 + 12/...
Thursday, May 3, 2012 at 11:22am

trig - nope
sorry, no diagrams here
Thursday, May 3, 2012 at 10:08am

trig
If x and y are complementary angles and 5 tan x-12=0,calculate by using a diagram the value of 2sin(squared)x+cos y.
Thursday, May 3, 2012 at 3:04am

Trig
T=1/F
Wednesday, May 2, 2012 at 4:45pm

trig
Not sure if you are better thinking in terms of degrees or radians, most people are more familiar with degrees 11π/8 radians = 247.5° so cos(11π/8) = cos(247.5°) (in quad III) = -cos 67.5 let that sit. 67.5 = 90-22.5 cos 67.5 = cos(90-22.5) = sin 22.5 (...
Monday, April 30, 2012 at 10:24pm

trig
I don't understand how to fnd it though Reiny :( perhaps you could help?
Monday, April 30, 2012 at 10:12pm

trig
(x,y) = (20.6cos102.5° , 20.6sin 102.5°)
Monday, April 30, 2012 at 10:02pm

trig
Oh I'm sorry. It's cosine (11pi/8) :)
Monday, April 30, 2012 at 9:59pm

trig
yea what reiny said
Monday, April 30, 2012 at 9:59pm

trig
11π/8 is an exact value. where does the trig part of your question come in? Was is something like sin (11π/8) ?
Monday, April 30, 2012 at 9:58pm

trig
What is the exact value of 11pi/8? (with steps please) :)
Monday, April 30, 2012 at 9:55pm

trig
to be perpendicular, the dot product must be zero to be parallel, one must a scalar multiple of the other. The question is very easy.
Monday, April 30, 2012 at 9:30pm

trig
Determine whether the vectors are parallel, perpendicular or neither. 1) v = (4,1), w = (1,-4) 2) v = (2,3), w = (4,6) 3) v = (2,3), w = (3,-3) Please and thanks!
Monday, April 30, 2012 at 9:15pm

trig
Find the component form for vector v with the given amplitude and direction angle theta. |v|=20.6, theta=102.5deg
Monday, April 30, 2012 at 8:51pm

trig
tan = -10 sqrt2/ -10 sqrt 2 becomes tan=1 which is 45degree
Monday, April 30, 2012 at 8:20pm

trig
(-10√2, -10√2), find te magnitude and direction angle of the vector, measure the direction angle in [0, 360). Please help!
Monday, April 30, 2012 at 8:16pm

trig
What is 3*11+7*(-5) ?
Monday, April 30, 2012 at 6:53pm

trig
Find the dot product of u and v u= 3i+7j v= 11i-5j
Monday, April 30, 2012 at 6:42pm

trig problem
F = 1c/min = 1rev/min. = Frquency. P = 1/F = 1min/rev. = The period. T = 13:12:40 - 13:0:0 = 12min,40s. = 12 2/3 min. = 38/3 min. 1rev/min * (38/3)min = 12 2/3 rev. (2/3)rev * 360Deg/rev = 240 Deg. Ar=240-180 = 60 Deg.=Reference angle. h = hmax*sinAr = 6*sin60 = 5.2 m.
Monday, April 30, 2012 at 3:05pm

Application prob. for Trig.
Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and back to 2m. At 13:00, ...
Monday, April 30, 2012 at 1:19pm

trig
since it's a max at t=0, that indicates a cosine function The period is 1, so we are looking at cos(2pi*t) max is 120, min is 80, so amplitude is 20, and oscillates around h=100, and our function is f(t) = 100 + 20cos(2pi*t)
Monday, April 30, 2012 at 11:54am

trig
At rest, the human heart beats once every second. At the strongest part of the beat, a person's blood pressure peaks at 120mmHg. At the most relaxed part of the beat, a person's blood pressure drops to 80mmHg. Supposing that t = 0 corresponds to the peak of the beat, ...
Monday, April 30, 2012 at 4:05am

Pre-Calc/Math
1) rewrite cosx (cosx/sinx) + sinx = csc x 2) cosx^2/sinx + sinx = csc x 3) multiply sinx by (sinx/sinx) to get same denominator this gives you cosx^2/sinx + sinx^2/sinx = cscx 4) combine your fractions (cosx^2 + sinx^2)/sinx = cscx 5) rewrite numerator 1/sinx= csc x and there...
Monday, April 30, 2012 at 1:00am

trig - incomplete
"near" doesn't mean anything. If the man is 100 ft from the tree, a 4-ft shadow means the tree is enormous. If the man is 2 ft from the tree, the tree is short.
Monday, April 30, 2012 at 12:18am

trig
a 6 foot tall man is standing near a tree on level ground .if the man shadow 4 feet long .how many feet tall is the tree?
Sunday, April 29, 2012 at 11:08pm

Trig. application
C = pi * D = 3.14 * 2*25.5 = 160.14 cm. = 1.614 m = Circumference. V = 30km/h = 30,000m / 60min=500 m/min. d = 500m/min * 4min = 2000 m. 2000m / 1.614m/rev =1239.157373 revolutions. A = 90 + 0.157373*90 = 104.2 Deg. h = 25.5 + 25.5*sin104.2 = 50.2 cm.
Sunday, April 29, 2012 at 10:29pm

Honors Trig.
Here is an easy way to do these. 1) convert all angles to 000N,090E, 180S, 270W Example: 456@29deg S of E. = 456@119 then convert to N, E coordinates. V= 456(Cos119 N + Sin119 E) Now for your problem: V= 550(cos295 N +sin295 E)+28(cos109 N+ sin109) combine N, E vector ...
Sunday, April 29, 2012 at 2:49pm

Honors Trig.
A plane is flying at a speed and direction of 550 mph, 25 degrees north of west. There is a wind of 28 mph, at an angle of 19 degrees south of the east direction. How fast is the plane actually flying? What direction is the plane traveling?
Sunday, April 29, 2012 at 2:38pm

Maths trig
Whats the workings out to get to these answers ? Jw ta
Sunday, April 29, 2012 at 12:29pm

Maths trig
Thanks :)
Sunday, April 29, 2012 at 12:27pm

Maths trig
sin2t = 2 sint cost sin3t = sint cos2t + cost sin2t (cos2t = 1 - 2sin^2 t)
Sunday, April 29, 2012 at 10:50am

Maths trig
Use compound angle formulae to express Second harmonic i2= sin2t and the the third harmonic i3=sin3t in terms of the first harmonic sint
Sunday, April 29, 2012 at 2:06am

algebra2/trig
1) looks like you are dealing with the cubes so term(n) = n^3 2) did you notice that each term is one less than a perfect square? e.g. 3 = 2^2 - 1 --term(1) 8 = 3^2 -1 -- term(2) 15 = 4^2 -1 24 = 5^2 - 1 35 = 6^2 - 1 so term(n) = (n+1)^2 -1
Saturday, April 28, 2012 at 10:43pm

algebra 2/trig
1) a (n ) = n ^ 3 1 ^ 3 = 1 2 ^ 3 = 8 3 ^ 3 = 27 4 ^ 3 = 64 5 ^ 3 = 125 6 ^ 3 = 216 2 ) a (n ) = n ^ 2 + 2 n 1 ^ 2 + 2 * 1 = 1 + 2 = 3 2 ^ 2 + 2 * 2 = 4 + 4 = 8 3 ^ 2 + 2 * 3 = 9 + 6 = 15 4 ^ 2 + 2 * 4 = 16 + 8 = 24 5 ^ 2 + 2 * 5 = 25 + 10 = 35 6 ^ 2 + 2 * 6 = 36 + 12 = 48
Saturday, April 28, 2012 at 10:31pm

TRIG
one rotation is 5π ft so the hypotenuse has length 5π and sin 15 = height/(5π) height = 5π sin 15° = ......
Saturday, April 28, 2012 at 10:12pm

algebra 2/trig
Write the next term of sequence,and then write the rule for the nth term. 1)1,8,27,64,....125 the nth is 2) 3,8,15, 24,.....35 the nth is Can you help me and correct ? thank
Saturday, April 28, 2012 at 9:16pm

TRIG
5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of the wheel after the wheel has completed one revolution? A. 4.07 ft B. 13.1 ft C. 8.13 ft D. 9.07 ft
Saturday, April 28, 2012 at 9:05pm

algebra2/trig
Write the next term of sequence,and then write the rule for the nth term. 1)1,8,27,64,....125 the nth is n 2) 3,8,15, 24,.....35 the nth is Can you help me and correct ? thank you
Saturday, April 28, 2012 at 7:55pm

trig question
Sorry, the web address is spaced out so you need to put it together..again sorry, but I really need the help. Much appreciated!
Saturday, April 28, 2012 at 6:05pm

trig question
Hi, my question is attached to the web below (picture), because I can't draw the diagram on here. Sorry for any inconvenience. Please help and thanks. imageshack . us/photo/my-images / 845 / img0043gx . jpg/
Saturday, April 28, 2012 at 6:02pm

trig question
But the question ask to find the area of AE and EB together
Saturday, April 28, 2012 at 5:55pm

trig-math
4. A carpenter wants to be sure that the corner of a building is square and measures 6.0 ft and 8.0 ft along the sides. How long should the diagonal be? A. 12 ft B. 10 ft C. 11 ft D. 14 ft 5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of ...
Saturday, April 28, 2012 at 4:32pm

math-TRIG
i thank you for the one u did i have 40 of these i got the ans to the rest these are the one i could figure out so plz any help i acan get i thNK U a lot
Saturday, April 28, 2012 at 3:40pm

math-TRIG
1. Which angle measure is consistent with all of the following criteria? (i) The reference angle is 40°. (ii) The angle is more than one revolution. (iii) The angle's terminal side is in Quadrant II. (iv) The angle isn't positive. A. –580° B. –500°...
Saturday, April 28, 2012 at 3:33pm

trig question
sorry 1 = EO, the side along the x axis
Saturday, April 28, 2012 at 3:31pm

trig question
a 30,60 , 90 triangle has sides 1 =AO, sqrt 3 = EA and hypotenuse 2 AB = 2 sqrt 3 your angle AOB is 2*60 = 120 OE the altitude is 1 Your area = (1/2)(1)(2 sqrt 3) = sqrt 3
Saturday, April 28, 2012 at 3:30pm

trig question
NEW DIAGRAM: On a unit circle, sin x = square root 3 over 2, with center O. Vertical line from top to center of circle is PO. Horizontal line from middle to right of circle is OE. Another vertical line of AB is parallel to PO. And radius of circle (line from O to A) is 1 unit...
Saturday, April 28, 2012 at 2:57pm

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