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October 2, 2014

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

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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

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
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-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

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

trig question
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. From A to E ...
Saturday, April 28, 2012 at 2:49pm

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 1:46pm

trig problem
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, ...
Saturday, April 28, 2012 at 1:27pm

Trig. application
Hello.. In your previous solution to the question: "Dave is going for a ride on his unicycle. The radius of the wheel is 25.5cm. When he gets on, the valve of the wheel is at its maximum height. He pedals along a path at a speed of 30km/h. At what height will the valve be...
Saturday, April 28, 2012 at 1:21pm

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 4:06am

Trig. application
Dave is going for a ride on his unicycle. The radius of the wheel is 25.5cm. When he gets on, the valve of the wheel is at its maximum height. He pedals along a path at a speed of 30km/h. At what height will the valve be located after he has cycled for 4 minutes? How do I find...
Saturday, April 28, 2012 at 1:01am

Trig Help!
Question: Trying to find cos π/12, if cos π/6 = square root 3 over 2, how to find cos π/12 using DOUBLE angle formula? This is what I got so far.. cos 2(π/6) = cos (π/6 + π/6) = (cos π/6)(cos π/6) - (sin π/6)(sin π/6) = cos^2...
Friday, April 27, 2012 at 11:59pm

Solving Trig equation
Solve the trig equation exactly in the interval 0≤x≤2π. tan x + tan π/3 ------------------ = square root 3 1 - tan x tan π/3
Friday, April 27, 2012 at 11:41pm

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