# Trigonometry

**trig**

how do you work find sin (a-B)beta sign. sin a = 12/13,a lies in quadrant II,and cos B = 15/17, B lies in quadrant I.

**trig**

solve for x in the following equations: 1) sin(arcsin x) = 1 2) 2arcsin x = 1 3) cos(arccos x) = 1/3

**Trig**

the horizontal speed of an airplane is 183mph. the magnitude of the plane's velocity is 200mph. write an expression describing the angle the angle the plane is climbing my solution: cos-1 183/200 is this right

**trig**

express 4/5-radical 13

**trig**

express 4/5-ã13 plz

**trig**

express 4/5-ã13 plz

**Trig**

the center of a circle x^2 + y^2 + 8y =1 is a. (0,-2) b. (0,4) c. (0,1) d. (0,-4) I believe the answer is (0,4) Am I correct ?

**Trig**

The center of the circle (x+2)^2 + (y-3)^2 =1 is a. (2,3) b. (-2,3) c. (2,-3) d. (-2,-3) I believe b. is the answer, is that correct?

**Trig**

The radius of: (x+2)^2 + (y-3)^2 =9 is 3 is this correct?

**Trig**

If the center of a circle is at (2,2) with a radius of 4 the equation of the graph would be : a) (x-2)^2 + (y-2)^2 = 16 b) (x+2)^2 + (y+2)^2 = 16 I think it would be b is that correct?

**trig**

A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ...

**trig**

prove that tan^2x+ sec^2x =1

**Trig**

Prove that 1 + tanAtanA/2 = tanAcotA/2 -1 = secA

**Trig**

Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??

**Trig**

sinAsin2A+sin3Asin6A+sin4Asin13A/sinAcos2A+sin3Acos6A+sin4Acos13A = tan9A

**Trig**

Half angle identities Find exact values of a) cos 1/2 b) sin 1/2 c) tan 1/2 based on: cos = 1/5 greater than 270 deg less than 360 deg. I get a) - rt 3/5 b) rt24/5 and c) does not work out at all .... Help please.. book says for answers a)-rt15/5 b) rt10/5 c) -rt6/3 How do you...

**trig**

for the equation 4 cos alpha - square root 12 = 0

**trig**

differenthate sin8x from first principle?

**Trig**

If sinx = 1/4 Find the exact value of cos2x I used the formula for double angle identities : cos2x = 1-2sin^2x and got the answer 1/2 The book says the answer is 7/8 How would they get to that conclusion?

**Trig**

If tanx = 2/3 tany = 1/2 then tan(x-y) = ?? a.7/4 b.7/6 c.1/8 d.8/6 which answer is correct ??

**Trig**

sin45cos25 + cos45sin25 = ?? a. cos70 b. sin70 c. cos20 d. sin 20 which answer is correct ??

**Trig**

cos45cos25 - sin 45sin25 = ?? a. cos70 b. sin70 c. cos 20 d. sin 20 which answer is correct ?

**trig**

Matt has a large family when looking at the dates of their birthdays, he noticed that every prime day had at least one birthday. this was also true for perfect squares cubes and multiples of 3,5,7, and 11. what days (1 to 31) are not represented

**Trig**

Use reduction identities to determine if the following statement is true or false: tan (A-B) = tan (B-A) Is this starement True or False ?

**Trig**

Rewrite tan 88 deg in terms of its cofunction How does that end up????

**I have a question concerning Spring Semester**

Im a freshman in college and I just took Chem1, Trig, and Drama (12units). I am planning on taking Chem2, Pre-Calc, and Art1 for spring sem. (13units). I'm not sure if this is too much to take for next semester considering two five unit classes or should I add another class? ...

**Trig**

3. In the figure below, the perimeter of the parallelogram ABCD is (6a + 8b + 29) and the perimeter of the triangle ACD is (3a + 4b + 32). What is the length of AC

**Solving trig functions! urgent please help!**

1.2sinxtanx + tanx-2sinx-1=0 2.6tan^2x-4sin^2x=1 Both functions is for 0<x<2pi thank you!

**Trig**

cot (tan + cot) = ?

**Trig**

( sec -1 )(sec +1 ) = ?

**Trig**

sin/tan = ?

**Trig - Thanks Damon and Lindsey**

Thanks a bunch

**trig**

The cross section of a television antenna dish is a parabola. A dish has a receiver that is located at the focus, 4 ft. above the vertex. Find the equation. (which I did) -- x^2 = 8y If the dish is 8 feet wide, how deep is it?

**Trig**

If sin = 2/3 and is a second quadrant angle, determine the exact value of sec^2 could be a. 5/9 b. root5/3 c. 9/4 d. 9/5 Please help.......

**trig**

You are sky diving and are trying to land on a target with a radius of 15 m. You land 10 m west and 10 m north of the center of the target. a. Write an inequality to describe the region inside the target area. b. Do you land within the target area? c. If another skydiver lands...

**trig**

cot^5 x = cot x/sec^4 x - 2 sec^2 x +1

**trig**

find the exact value of sin(u+v) given that sin u=3/5 and sin v= 15/17

**trig**

Solve the following equation for È <= È <= 2(pi) 2 tan È + 3 = tan È

**trig math**

Prove that tan(theta)tan(60+theta)=tan3theta

**Trig**

The next two steps in solving this trig identity question are ??? 1/csctheta x costheta x sintheta x sectheta = sinsqtheta arghhh need help please

**Trig**

Prove the equation is an identity : csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta wow ... try that one

**Trig**

Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. Don

**Trig**

Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities

**Trig**

Column 1 Column 2 sec theta - cos theta tan theta sin theta Question: how do you get column 1 to be the same as column 2 ?? using the eight fundamental identities

**Trig**

Please disregard last question .... wrote it down wrong .. Thanks

**Trig**

Eight Fundamental Identities Sec thada - Cos thada How do I do this?

**trig (pre-cal class)**

Suppose è is an acute angle of a right triangle. For this function, find the values of the remaining five trigonometric functions of è. Round to four decimal places. sin è = 0.1 cos è = tan è = cot è = csc è = sec è =

**trig**

How do you find 2.8 revolutions per second in radians? I understand that two revolutions would be equal to 4pie but how do you find the 0.8?

**trig**

A force of 50 pounds acts on an object at an angle of 45°. A second force of 75 pounds acts on the object at an angle of -30°. Find the direction and magnitude of the resultant force.

**trig**

A bolt secured to a bridge is being acted upon by forces being exerted by two cables attached to the bolt. The force vector for one of the cables is represented by F1 = <1.7,9.8>. The other force vector, F2, is known to have a magnitude 5 and a direction angle of 10 ...

**trig**

SinA =0.5 cosA=?

**trig**

Find ALL solutions to the equation on the interval [0, 2pie]: 2sin(1/2X) = 1

**trig**

Find the exact values of the inverse function arcsin 1/2

**trig**

A tree casts a shadow 203 feet long. Find the number of feet in the height of the tree knowing that the angle of elevation of the sun is 16 degrees. Give your answer to the nearest integer. a. 57 b. 56 c. 61 d. 58 e. 55

**Trig**

The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that is(are) in the interval (0,π/2) is one of following a. {π/6} b. {π/3} c. {π/4} d. {π/3, π/6} e. {π/6, π/4}

**Trig**

In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A

**Trig**

How do you find cosine, tangent, and cotangent periods?

**Trig**

Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. ...

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. M...

**Math - Trig**

For the equation 4 cos theta - square root 12 = 0, where 0 < theta < (or equal to) 2 pi, determine the measure of theta. The answers to choose from are: A) pi/ 3, 5 pi/ 3 B) 2 pi/ 3, 4 pi/ 3 C) 5 pi/ 6, 7 pi/ 6 D) pi/ 6, 11 pi/ 6 Please explain and show work, because I ...

**trig**

Find the exact value of the trigonometric function. -cot(pi/4 + 16pi)

**trig**

How do you evaluate the expression cos3pi

**trig**

A satellite is in geostationary orbit 22,500 miles above the earth. IF the radius of the earth is 3,960 miles, how fast is the satellite moving in miles per day? How fast is the satellite moving in miles per hour?

**Math**

Trying to understand an inverse trig function. Evaluate Cos^-1 (sqr3/2) So I know it's 30 degrees, but wouldn't it also be 150 degrees because the Arc-cos is defined in the 2nd quadrant?

**trig**

Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0

**trig**

How do I solve.... Tan 2(theta) - Cos 4(theta) = 0 Domain: (0-360 degrees) Thank you.

**Math: Trig**

to determine the height of a pole across a road, Justin takes two measurments. he stands at Point A directly across from the bass of the pole and determines that the angle of elevation to the top of the pole is 15.3 degrees. he then walks 30m parallel to the freeway to point C...

**trig**

How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

**trig**

The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller whose aircraft whose engine is expected to run at a maximum of 2800 rpm

**trig**

If θ is an angle in standard position and its terminal side passes through the point (20,-21), find the exact value of sec(θ).

**trig**

If (cosa-sina)/sina = 2 , then what is tga = ?

**trig**

find an expression equivalent to sec theta sin theta cot theta csc theta

**Math- Trig**

In an oblique triangle ABC, A=30 degree, and the perpendicular from C to AB is 12 inches long. Find the length of AB.

**trig**

Prove that the statement is an identity: (tanx/cscx)=(1/cosx)-cosx

**trig**

tan theta= -4/3 and sec theta<0 find sin (theta = pi/6)

**Trig**

1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...

**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)

**Math - Trig please help!**

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 ?

**Math -Trig Please help!**

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 ?