# Trigonometry

trig
simplify: (2sin(2pie/7))/(3cos(3pie/14)

trig
I need to prove parallelogram law using the law of cosines. 2AB^2 + 2BC^2 = AC^2 + BD^2 Please, help me to do this.

trig
Cos 3 alpha = - 0.1 solutions in degree

trig
a right triangle contains a 25 angle. if me leg is of length 5 inches what is the length of the hypotenuse

trig
CosA*Cos17=1 then determine A

Trig
Sec (23π/6)

State two intervals in which the function y=7sin(1/5x)+2 has an average rate of change that is: a) zero b)a negative value c)a positive value Please explain how to get the intervals! Thanks a lot in advance!

trig
Find all the solutions of 2 sinx=1-cosx in the interval from 0° ≤x<360°

trig
if the terminal ray of an angle 0 in standard position passes through the point (-1,3),then cos0=

trig
find all solutions of 2sinx=1-cosx in the interval from 0 to 360

precalc/trig
Solve the Logarithmic equation algebraically. Give an Exact Answer and an approximation for x to four decimal places. 20 log(2x+2)=45

precalc
Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1, where your theta is in degrees. B. The Trig form of z1*z2, where z2=5[cos(60degrees)+isin(60degrees)] C. The Trig Form of (z1)^4

trig
Find the exact solutions of the equation in the interval [0,2pi). sin(x/2)+cos(x)=0

trig
We are doing trig identities in school. I need help with these five: 1.1+sinx/1-sinx=cscx+1/cscx-1 2.tanx+sinx/1+cosx=tanx 3.sec^2x/sin^2x=1/sin^2x+1/cos^2x 4.tan^2x/1+tan^2x=1-cos^2x 5.sinx-sin^3x/cos^3x=tanx

trig
a 30 foot ladder leans against a wall at a 71 degree angle of elevztion find the distance of a ladder's base to the wall

trig
Mr. Saurik proposed that the function h(t) = 6sin(3pi(t) - pi/3) + 5, where h(t) is in meters and t is in seconds, models the height above the ground of a point on a spinning wheel. Is Mr. Saurik's equation plausible? Explain.

precalc/trig
Write the partial fraction decomposition of the rational expression. 4x^2–19x+31/ (x+2)(x^2–4x+5)

trig
How to prove the theorem of sines, using S=(a*b/2) * sin γ ?

At one time, Maple Leaf Village (which no longer exists) had North America’s largest Ferris wheel. The Ferris wheel had a diameter of 56 m, and one revolution took 2.5 min to complete. Riders could see Niagara Falls if they were higher than 50 m above the ground. Sketch ...

trig
express the product of radical 90 x radical 40 -radical 8 x radical simplifies to ?

trig
Patients with acute or serious infections, such as Salmonella typhi or gram-negative bacteria causing meningitis, can be successfully treated with regular doses of Chloramphenicol. A patient weighing 150 pounds requires a dose of 850 milligrams, while a patient weighing 300 ...

trig
for what values of theta between 0 and 2 pi is the function of theta equal sine theta positive?

trig
I need to count this: a) 1-tg^2a/1+ctg^2a, when sina =2/3 b) 1-tg^2a/1-ctg^2a, when cosa= -1/3 c) tga * cos^2a, when sina + cosa=5/7 d) tg^2a + 1/sina * 1/cosa + ctg^2a, when tga + ctga =5

trig
I need to prove equality. a) (sina + cosa)^2 -1 / ctga - sinacosa = 2tg^2a b) (sin^2x/sinx-cosx) - (sinx+cosx/tg^2x+1) = sinx + cosx c) sin^4a - sin^2a - cos^4a + cos^2a = cosπ/2 How to do these?

trig
For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x,y). y=7cos(x-pi/6) for x=pi/6, pi/3, 2pi/3, pi, 7pi/6

A tire with a diameter of 100 cm rotates 20 times in 3 seconds. a) determine the angular velocity b) how far the tire has travelled? c) what is the speed in km/h?

precalc/trig
Find the trigonometric form of the number. (Round any angles to two decimal places.) −8 − i

trig
Solve the equation for exact solutions over the interval [0, 2pi]. 4 cotx+2=-2

trig
Write cot(t) in terms of sin(t) if the terminal point determined by t is in the first quadrant. Do not leave a fraction inside a radical or use absolute value.

trig
cos t=.7, tan t<0. find the values of the other 5 trigonometric functions.

trig
find sin of theta if cos is less than 0 and cot equals 3

trig
Use the Law of Sines to solve each triangle. P=110 degrees p=125, r=200 in triangel PQR

math/Right triangle trig
Your favorite team is attempting a field goal. The ball is kicked at an angle of 45 degrees with the field. The ball covers a horizontal distance of 85 inches before the kick is blocked. What is the minimum height the opposing team's player can be to block the kick?

Trig/Math
RST is a triangle with right angle S. If s- 21.3 Angstroms and t=8.71 Angstroms, find the measure of the larger acute angle.

Trig
Triangle ABC has B= 137degrees, A=31.6 in., and C=42.8 in. Find B.

trig
In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base

trig
In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base

trig
if tan theta=7/24 and sin theta is greater than 0 what is the exact value of sin theta

trig
A and B are acute angles such that cosA =3 over 5 and cosB =12 over 13

trig
Find the exact value of the trigonometric function given that sin u = − 8/17 and cos v = − 3/5. (Both u and v are in Quadrant III.) cot(v − u)

Alg. II/Trig
If m and n are real numbers, i^2=-1, and (m-n)-4i=7+ni, what is the value of m?

Trigonometry
Help trig question involving discriminant? a)Find the value of the discriminant. b)Use any method to find the real roots of the equation if they exist. 2x^2+7x=0

trig
5. If the angles X and Y each measure between 0° and 90°, and if sinX = cosY, what is the sum of the measures of the angles X and Y?

is this graphable??? y=x^2-4x-2

trig
-Find sin(x+y), cos(x-y), tan(x+y) and the quadrant of x+y sinx=-3/5, cosy=-7/25, x and y in Q3

trig
What is the exact value of 19 pie divided by 12.

Trig
The path of a projectile fired at an inclination t0 to the horizontal with initial velocity v feet per second is a parabola. The horizontal distance R, in feet, that the projectile travels is given by R = v2sin(2t)/32.2. What is R if v = 152 and t = 74? Give your answer to the...

trig
If sin(t) = -2/48 and cos(t) < 0 what is the value of cos(t) to the nearest thousandth? If sin(t) = -14/34 and cos(t) < 0, what is the value of tan(t) to the nearest thousandth? If tan(t) = -15/19 and sin(t) < 0, what is sin(t) to the nearest thousandth? If tan(t) = ...

Trig
Solve the equation in the given domain cos 4x + cos 2x = 0, 0<(or equal to) x < pi

trig
an isosceles triangle has a perimeter of 60in. the congruent sides measure (2x+9)cm. the length of the third side is 3xcm. what is the value of X?

trig
cosθ =5/13 with -π/2 < θ <0 find each of the following sin( θ - 5π/4) cos( θ - 11π/6) tan( θ + 5π/4) can some1 explain to me how to do these? im completely lost and this is the only thing about my assignment that i cant do can...

trig
find the coordinates of the terminal point on the unit circle determined by t=9pt/7 to two decimal places

Math/trig
Solve the equation in the given Domain: 1-cos theta/ sin theta = sqr3, 0degrees <or equal to theta < 369 degrees cos4x + cos 2x =0, 0<or equal to x < pi

Trig
I have these sum and product property problems and I just want to make sure my work is right. Write equations expressing 1. cos 37degrees cos99degrees as a sum Answer: sin136+(-62) 2. sin4+sin7 as a product Answer: 2sin5.5 sin-1.5 3. cos 8x - cos 2x as a product Answer -...

trig
Cos(-11/12) use the sum or difference formula to find the exact number

Trig
cos(-11pi/12)

Algebra/trig
How would i use my calculator to find the approximate value of the expression, cot 0.2748 rad

trig
Find theta such as tan(theta) = cot(theta+45). Thanks

trig
How to do this one? (sina/1-cosa) + (1-cosa/sina) = Also, wanted to ask if I did another one right: 1 - sin^2a + tg^2a * cos^2a = 1 - sin^2a + (sina/cosa)^2 * cos^2a = 1 - sin^2a + sin^2a = 1 ???

trig
Please help me how to do this: 1) 1 + sina*cosa / (cosa + sina)^2 = 2) sina + cosa / 1- 2sin^2a =

trig
determine the phase shift of y = sin(3x - 2pi). indicate whether the shift is to the right or left.

trig
I have these sum and product property problems and I just want to make sure my work is right. Write equations expressing 1. cos 37degrees cos99degrees as a sum Answer: sin136+(-62) 2. sin4+sin7 as a product Answer: 2sin5.5 sin-1.5 3. cos 8x - cos 2x as a product Answer -2sin5x...

trig/math
If A is between 270degrees and 360degrees, and cos A=12/13, find the exact value of: sin2a, cos2a, sin1/2a, cos1/2a

trig
whatis the possibilities for the square root of 2 times tan theta = 2 sin theta

trig
To the nearest degree, determine the measure of <X for each value of tan X if the tan X = 0.25

trig
Two office towers are 43m apart. From the top of the shorter tower, the angle of elevation to the top of the taller tower is 26o while the angle of depression to the base is 51o. Determine the height of each tower and round your answers to one decimal place.

trig
a tree growing on a hillside casts a 102-foot shadow straight down the hill. Find the vertical height of the tree if, relative to the horizontal, the hill slopes 15.0 degrees and the angle of elevation of the sun is 62.0 degrees.

trig
whats 21° 44' 3" as a decimal to the nearest thousandth of a degree

trig
find all the values of x that satisfy the equation: 2sin^2(x) + 1 = 3sin(x).

trig
What is inverse cot of negative radical 3/3

Trig
Im having serious issues with verifying Trig. identities. Please help! Here is an example: (tanX-secX)^2= 1-sinX/1+sinX

state the amplitude, period, and phase shift of the function -0.4 sin (10x+pie/2)

trig
given that sin(a+b)= 56/65, cos(a+b)-33/65, cos(b)=-12/13 and pi/2<b<pi Find: sin(a)? cos(a)? tan(a)?

Trig
Prove the following functions: (sinx+sin2x)/(1+cosx+cos2x)=tan x (cos3x/sinx)+(sin3x/cosx)=2cot2x tan2x=(2/cotx-tanx) theses are due in the am. Fastness would be great?

trig
write a product of two trig functions that equals 1.

trig
write an equation expressing 19cos(theta-50degrees) as a sum of sine and cosine.

trig
write an equation expressing: cos37cos99 as a sum Review question. I know the formula. Having trouble with working it out.

trig
write equations expressing: 19cos(theta-50degrees) as a sum of sine and cosine.

Math C30 ( trig )
A roof in the shape of an upside down cosine wave is to be buile to cover an arena. The arena is 24m wide, the height of the roof at either side wall is 5m, and the maximum height of the roof is 9m. A) write a function that gives the height of the roof in terms of your ...

Math C30 ( trig )
Solve : cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 Give exact answers and formula for the general solution as well as the specific solutions.. Help

trig
Find exact value of the expression. sin( 27pi/4 + 17pi/6)

trig
y= -(x-5)2 -3

Trig
Solve 2cosxsinx + sinx = 0 using unit circle.

Trig
Solve 2cos sq x = 1 using the unit circle.

Trig
Find all real numbers that satisfy the equation. 2 cos x + 1 = 0

trig
Hi, I need to find the domain and rnge of the following: 1. X= 1/2 (cos theta + theta sin theta) Y=1/2 (sin theta - theta cos theta) total guess here, but here goes Domain cos theta = +/- 1 and domain sin theta = +/- 1 so domain theta sin theta = 0- +/-infinity so domain of X...

trig
I'm confused with this concept: Okay, so I have this problem: cos2x( 2 cos+1)= 0 I understand I have to work the problems separately and I get cos x= 2 and cos x= 1/2 Now, what I don't understand is how this connects to pi, radians or the unit circle. If someone could explain ...

Trig
Find the measure of the central angle, in radians, given the area of the sector as 22.6 cm2 and a radius equal to 3.7 cm

trig
(3 tan^2x-1)(tan^2-3)= 0 can someone please explain how to do this problem and then explain the whole pie thing at the end...like, this is suppose to equal pie/6 b/c it's tan...im soooo confused.....

trig
guy wire is attached to a pole for support. If the angle of elevation to the pole is 67° and the wire is attached to the ground at a point 137 feet from the base of the pole, what is the height of the pole (round to 2 decimal places)?

trig
given the following values, what is angle B? A= 46 degree b= 4 c= 8

trig derivatives
How do I find the derivative of 6 + 8cosx?

trig
L ii i i i i i i i i A i i i i i i i i i i 4000 miles i i i i E ii right triangle have to find side EL. The range of a lighthouse is the maximum distance at which its light is visible. In the figure, point A is the farthest point from which it is possible to see the light at ...

trig
Since its construction in 1821, Marblehead Lighthouse has stood at the entrance to Sandusky Bay, guiding sailors along Lake Erie’s rocky shores. The 65-foot tower is one of Ohio’s best-known landmarks and the oldest continuously operating lighthouse on the Great Lakes. 1. ...

trig
The Hall of Fame exhibits are displayed in an eight-story, 162-foot tower. Pei originally designed a 200-foot tower, but had to reduce its height to meet the requirements of a nearby airport. From the top of the existing tower, an observer sights the entrance to the museum’s...

Trig/Algebra II
(3+√2)/(3-√2) is equivalent to: a. (11+6√2)/ 7 b. (11-6√2)/ 7 c. 11/7 d. 7/ (11+6√2)

Calc
How do you do the derivative of an inverse trig function? arcsin (sqrt2/2)??

trig
Find another angle theta between 0 and 2pi that has the same cosine as 3pi/14

Algebra
algebra 2 trig: A food vendor at a stadium sells hot dogs for \$2. At this price, she can sell about 500 hot dogs per day. For every \$.25 increase in price, she will sell 25 less hot dogs. The vendor's revenue can be modeled by R=(500-25x)(2+0.25x) Use vertex form to find how ...

trig
let P be a point in Q1 such that the slope of the line connecting P to the origin is sq. root of 2 and the distance from P to the origin is 3 units. Find the coordinates of P, state all trig values for angle formed by the line and the positive x-axis, and the measure of said ...