Friday

May 22, 2015

May 22, 2015

**trig**

A guy wire runs from the ground to a cell tower. The wire is attached to the cell tower 150 feet above the ground. The angle formed between the wire and the ground is 40° (see figure). (Round your answers to one decimal place.)
*Wednesday, June 20, 2012 at 3:46pm*

**trig**

Two forces of 5 lb. and 14 lb. act on a body at right angles to each other. Find the angle their resultant force makes with the force of 14 lb
*Wednesday, June 20, 2012 at 1:50pm*

**trig**

A roadway rises 55ft in horizontal distance of 1/2 mile (1mile=5280ft) Find the tangent of the angle that it makes with the horizontal.
*Tuesday, June 19, 2012 at 12:26pm*

**trig**

Give the component form of the resultant vector in the following. NOTE: Answer must be typed in using the following format -- including the parentheses: (#,#). u =(10, 5) -3u=
*Friday, June 15, 2012 at 11:15am*

**trig**

A pendulum is 18 feet long. Its central angle is 44º. The pendulum makes one back and forth swing every 12 seconds. Each minute, the pendulum swings _____ feet. (Answer to the nearest foot.)
*Thursday, June 14, 2012 at 12:59pm*

**trig**

Use a table of trigonometric values to find the angle è in the right triangle in the following problem. Round to the nearest degree, if necessary. cos è =0.9659 A=? H=20
*Wednesday, June 13, 2012 at 4:44pm*

**Trig**

Find sin2theta, cos2theta if csctheta=13/12 and lies in quadrant II. Thank you!
*Wednesday, June 13, 2012 at 2:06am*

**Trig **

The length of the base of an isosceles triangle is one fourth the length of one of its legs. If the perimeter of the triangle is 16 inches, what is the length of the base?
*Monday, June 11, 2012 at 6:15pm*

**trig/math**

Determine the period, amplitude and phase shift for each given function: A)y = -4 cos 3x + 5 B)y = 2/3 sin (30x-90)-10 c)y = -0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi
*Monday, June 11, 2012 at 5:17pm*

**Math/Trig**

How would I evaluate these trig functions without using a calculator? U: sin(-13π/6) cot 11π/6 cot(-14π/4) sec 23π/6 Thanks in advance ^^; and if you'd tell me step by step on how to do problems like these I'd be grateful :D
*Monday, June 11, 2012 at 5:03am*

**Calculus**

integral of cscx^(2/3)(cot^3)x i know that cot^2x is csc^2(x)-1, but i just don't understand how to solve the cscx^(2/3), any help? i also know that its trig integrals/substitution...
*Sunday, June 10, 2012 at 12:05pm*

** trig**

A tunnel for a new highway is to be cut through a mountain that is 260 feet high. At a distance of 200 feet from the base of the mountain, the angle of elevation is 36 degrees. From a distance of 150 feet on the other side of the mountain, the angle of elevation is 47 degrees...
*Wednesday, June 6, 2012 at 1:36pm*

** trig**

A tunnel for a new highway is to be cut through a mountain that is 260 feet high. At a distance of 200 feet from the base of the mountain, the angle of elevation is 36 degrees. From a distance of 150 feet on the other side of the mountain, the angle of elevation is 47 degrees...
*Tuesday, June 5, 2012 at 8:07pm*

**trig.**

How is it that sin90 is negative?
*Wednesday, May 30, 2012 at 9:35pm*

**trig**

solve equation for the exact solutions if possible put answer in degrees. 2tanx/3-tan^2x=1
*Wednesday, May 30, 2012 at 7:04am*

**trig**

solve equation for exact solution if possible leave answer in degree sinx/2=square root of 2- sinx/2
*Wednesday, May 30, 2012 at 6:59am*

**Trig**

The first 40 rows of seating in a certain section of a stadium have 25 seats, 28 seats, 31 seats, and so on. The 41st through the 75th rows each contain 125 seats. Find the total number of seats in this stadium section.
*Wednesday, May 30, 2012 at 12:18am*

**trig**

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4
*Monday, May 28, 2012 at 11:36pm*

**trig**

AB = 8 cm, AC = 6 cm, AD = 7 cm, CD = 2.82 and CAB=50° (a) the length BC (b) The size of angle ABC; (c) The size of angle CAD (d) The area of triangle ACD
*Sunday, May 27, 2012 at 5:08pm*

**trig**

An electric pole is supported to stand vertically on a level ground by a tight wire. The wire is pegged at a distance of 6 meters from the foot of the pole. The angle that the wire makes the ground is three times the angle it makes with the pole.
*Sunday, May 27, 2012 at 4:35pm*

**trig**

plot of land ABCD such that AB = 85m, BC = 75m, CD = 60m, DA = 50m and angle ACB = . Determine the area of the plot in hectares correct to two decimal places
*Sunday, May 27, 2012 at 4:33pm*

**algebra 2/trig**

x+5 1 ------- - 1= ------- x^2-2x x^2-2x
*Sunday, May 27, 2012 at 1:23pm*

**Calc- Trig Substitution **

integral of dx/square root(x^2-64) My answer is: ln (x/8 + square root(x^2-64)/8) +c is this right?
*Friday, May 25, 2012 at 2:23am*

**trig**

Solve cos x-1 = sin^2 x Find all solutions on the interval [0,2pi) a. x=pi, x=pi/2, x= 2pi/3 b. x=3pi/7, x=pi/2, x=2pi/3 c. x=3pi/7, x=3pi/2, x=3pi/2 d. x=pi, x=pi/2, x=3pi/2
*Wednesday, May 23, 2012 at 11:12pm*

**trig**

evaluate the expression tan (257pi/4) a.-1 b. -(sqrt2)/2 c. 1 d. (sqrt2)/2
*Wednesday, May 23, 2012 at 9:44pm*

**trig**

A tree casts a shadow of 27 meters when the angle of elevation of the sun is 26 degrees. Find the height of the tree to the nearest meter. a. 24 m b. 15 m c. 320 m d. 13 m
*Wednesday, May 23, 2012 at 9:40pm*

**trig**

a voltmeter's pointer is 3 cm in length. find the degrees through which is rotates when it moves 1.1 cm on the scale?
*Wednesday, May 23, 2012 at 11:11am*

**trig**

6. Compute the modulus and argument of each complex number. I did a-c and f. D. -5 E. -5+5i G. -3-4i 7. Let z= -5sqrt3/2+5/2i and w= 1+sqrt3i a. convert z and w to polar form b. calculate zw using De Moivres Theorem c. calculate (z/w) using De M's theorem Please help with ...
*Wednesday, May 23, 2012 at 12:41am*

**trig**

Find all solutions of cos 2x + √2/2 =0. a) + or - 3/8pi +Kpi b) 2/3pi + Kpi, 5/3pi + Kpi c) + or - 2/5 +Kpi d) 2/3 pi + 2Kpi, 5/3pi + 2Kpi I really need help on this question :(
*Tuesday, May 22, 2012 at 11:27pm*

**Trig**

what are the rectangular coordinates of (-2(pi/6))? please help.
*Tuesday, May 22, 2012 at 11:25pm*

**math trig**

ln(2x-5)= 4 how do i this problem? thanks!
*Monday, May 21, 2012 at 10:45pm*

**TRIG**

I need to state the period and 2 consecutive asymptotes on the graph for the following questions. 1: y = -3 tan pi*x period: pi (?) asymptotes: ? 2: y = 2 sec 4x period: ? asymptotes: ? 3: y = csc (x/3) period: ? asymptotes: ? 4: y = 3 cot (pi*x/2) period: ? asymptotes: ?
*Monday, May 21, 2012 at 6:03pm*

**graphing trig functions**

given y=(3x+2pi) how would i graph one period this without a calculator? amplitude:1 period: 2pi/b = 2pi/3 is this correct? what is the minimum and maximum points?
*Sunday, May 20, 2012 at 10:15pm*

**trig**

how can you find points of a tri equation at orgin 1/4, 1/2, 3/4, and end of the period
*Sunday, May 20, 2012 at 9:53pm*

**Trig**

Find two values of theta that satisfy the equation. give your answers in degrees (0degrees <theta<360degrees ) and radians (0<theta<2pi) a. sin θ= sqrrt3/2 b.sin θ= - sqrrt3/2
*Saturday, May 19, 2012 at 10:44pm*

**Trig**

Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s.? Radius, r=16 ft Arc length, s=10 ft
*Friday, May 18, 2012 at 12:51pm*

**graphing trig functions**

for graphing basic trig functions such as y=2sinx or y=1/3cosx, how do you know what the points are to graph with out using a calculator?
*Friday, May 18, 2012 at 12:31am*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*Thursday, May 17, 2012 at 9:38pm*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*Thursday, May 17, 2012 at 7:18pm*

**trig**

find the angle between vector U=<2,3> and V=<1,-5> answers: 88 degrees, 45 degrees, 135 degrees, or 92 degrees...?
*Thursday, May 17, 2012 at 7:13pm*

**trig 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. Please help, thank you!
*Thursday, May 17, 2012 at 7:10pm*

**trig**

write y=sinx-cosx in the form y=ksin (x+a), where the measure of a is in radians. answers: sqrt2sin (x+3pi/4), sqrt2sin (x+5pi/4), sqrt2sin (x+pi/4), or sqrt2sin (x+7pi/4) ...?
*Thursday, May 17, 2012 at 6:49pm*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*Thursday, May 17, 2012 at 6:42pm*

**trig**

Write an equation for simple harmonic motion, given that the amplitude equals 4 inches and the period equals 2 seconds and the max displacement occurs when t=0. answers: y=4sin pi t, y=4cos pi t, y=4cos t, y=4sin2 pi t
*Thursday, May 17, 2012 at 6:24pm*

**trig**

an angle with the radian measure of 9pi/5. find radian measure of its reference angle. answers: -4/5, 4pi/5, -pi/5, or pi/5
*Thursday, May 17, 2012 at 6:21pm*

**trig**

what is the exact value of sin[tan^-1(2/3)]
*Thursday, May 17, 2012 at 6:19pm*

**trig**

U=5i+11j and V=2i-3j, find 2U-7U
*Thursday, May 17, 2012 at 5:02pm*

**trig**

write 2+2 squareroot of 3i in trig form.
*Thursday, May 17, 2012 at 5:01pm*

**trig**

find the angle between vectors U= <2,3> and V= <1, -5>
*Thursday, May 17, 2012 at 4:53pm*

**trig**

a vector has a magnitude of 16 and direction of 120 degrees. write the vector in terms of unit vecotrs i and j.
*Thursday, May 17, 2012 at 4:52pm*

**trig**

what is the magnitude and direction of the vector U= -2i - 3j
*Thursday, May 17, 2012 at 4:50pm*

**trig**

write y=sinx-cosx in the form y=ksin (x+a), where the measure of a is in radians.
*Thursday, May 17, 2012 at 4:48pm*

**trig**

solve 2cos^2x-sinx=1, 0 < or equal to x < 2pie
*Thursday, May 17, 2012 at 4:47pm*

**trig**

write sin4xcos2 as the sum or difference of two functions.
*Thursday, May 17, 2012 at 4:45pm*

**trig**

what's the single trig. function of cos6xcosx-sin6xsinx
*Thursday, May 17, 2012 at 4:44pm*

**trig**

Given sin a = 15/17 with a in Quadrant I and cos beta = 4/5 with beta in QuandrantIV, find the exact value of cos(a+beta)
*Thursday, May 17, 2012 at 4:43pm*

**trig 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...
*Thursday, May 17, 2012 at 2:51pm*

**trig 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...
*Thursday, May 17, 2012 at 2:51pm*

**trig 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...
*Thursday, May 17, 2012 at 2:50pm*

**trig**

what is the amplitude, phase shift, and period of -3sin(2t- pie/3)
*Wednesday, May 16, 2012 at 10:56pm*

**trig**

on a triangle, A = 50 degrees, B = 81 degrees, and c = 12. what does a, b, and C equal?
*Wednesday, May 16, 2012 at 10:54pm*

**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**

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**

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**

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

**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**

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

**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!**

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

**trig pre calc**

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

**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*

**trig**

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

**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**

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**

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*

**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**

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**

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

**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**

(-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**

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

**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**

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*

**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*

**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**

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*

**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*