266 Answered Questions for the topic trigonometric identities

Trigonometric Identities Trigonometry Trig Trigonometric Functions

04/13/18

State the amplitude and period of this function: y = -3cos(pi/3)x.

State the amplitude and period of this function: y = -3cos(pi/3)x.
Trigonometric Identities

04/13/18

State the amplitude and period of this function: y = 4sin(1/2)x

 State the amplitude and period of this function: y = 4sin(1/2)x
Trigonometric Identities

04/11/18

Evaluate the angles using sums as products or products as sums. (1) sin (75 degrees -15 degrees) 2) cos (65 degrees - 25 degrees)

Using either the sums as products or products as sums to work out the answer.
Trigonometric Identities

04/11/18

The graph of tangent is continuous (i.e. has no breaks) true or false

Is it that the line of the tangent in the graph will be a continuous or broken 
Trigonometric Identities

03/28/18

how do i prove the following trig identities

cotxsinx=cosx  also tanxcotx-cos^2x=sin^2x
Trigonometric Identities

03/24/18

proving the sum and difference equation for cosine

Suppose that 𝒗 and 𝒘 are unit vectors. If the angle between 𝒗 and 𝒊̂ is 𝛼 and that between 𝒘 and 𝒊̂ is 𝛽, prove that cos(𝛼−𝛽)=cos𝛼cos𝛽+sin𝛼sin𝛽
Trigonometric Identities Precalculus

03/07/18

I need to prove that the equation (sin^3 + cos^3)/(1-2cos^2) = (sec - sin)/(tan-1) is true using fundamental trig function properties...any help?

I am using trigonometric identities like the fundamental identities and pythagorean-rules to substitute/cancel terms until I end up with the same thing on the left of the equation as I have on the... more
Trigonometric Identities

03/03/18

If tan(θ)= - Rad14 and 90°<θ<180°, what is csc(θ)?

the 14 in the equation is supposed to be under a radical i just couldn't do that on my computer
Trigonometric Identities Trigonometry Trig Pre Calculus

03/02/18

Solve on the interval [0, 2pi) (cosx+1)(2cos^2x-3cosx-2)=0

I'm really confused on how to solve this.
Trigonometric Identities Trigonometry Trig Pre Calculus

03/02/18

How to solve cos(x)(cosx+1)=0

I missed this class so I'm really confused on how to solve this.
Trigonometric Identities Pre Calculus Trigonometric Functions

02/23/18

Can someone explain to me how you would establish this identity: cos(a-B)•cos(a+B) = cos^2a - sin^2B

Please include each step so I can follow along
Trigonometric Identities Trigonometry

02/23/18

Which of the following represents the given expression in terms of CosΘ, in simplified form?

3(sec^2Θ - tan^2Θ)/ 2sec^2Θ   a. 3/2cos^3Θ b. 15/2cos^5Θ c. 3/2cos^3Θ
Trigonometric Identities

02/04/18

Find the angle θ such that 2θ + sin θ = cos θ

In this problem angle theta must be greater than 0 and lesses than 2 pi
Trigonometric Identities Trigonometry Trig Trigonometric Functions

01/31/18

TRIG 1/2 ANGLE FORUMLAS

The questions are: "If sin B = -1/3 with B in QIII, find tan B/2. Also find sin B/2   The answer for tan B/2 is-3-2sqrt(2)   The answer for sin B/2 is \sqrt((3+2\sqrt(2))/(6))   These are... more
Trigonometric Identities Trigonometry Sum And Difference Identity

01/30/18

Trig Identities

If sinθ=5/13 is in quadrant 2, what is the value of sin(θ+3pi/2)?
Trigonometric Identities Trigonometry Trig Trigonometry Identities

01/28/18

Need Help Solving cos -105 with sum or difference identity

The question is cos -105. I know how to do the process for it but for some reason my answer doesn't have the right negatives. I am getting:   √2 + (-√6) --------------         4   The actual... more
Trigonometric Identities Trigonometry Trig Trigonometry Identities

01/26/18

Can't Solve -1-√3 * 1-√3 ------- ------ 1+√3 * 1-√3

I am doing sum and difference formulas with sin, cos, and tan. I am doing tan75 with the difference formula.   So tan 120-45   I have all the things found I just don't know how to multiply it... more
Trigonometric Identities Precalculus Trigonometry

01/26/18

Sinθsecθ simplify

simplify and show all work please
Trigonometric Identities Precalculus Trigonometry

01/26/18

Cosxsin^2x-cosx

simplify and show all work please
Trigonometric Identities

01/11/18

cosec x - sin x = cos x cot x

Prove each of the following identities 
Trigonometric Identities Trigonometry Identities

12/29/17

Rewriting trigonometric identities

How do I rewrite (tanθ+secθ)/cosθ in terms of sinθ? (fully simplified)
Trigonometric Identities Math Precalculus Trigonometry

12/03/17

I don't understand what this trig problem is asking!!!!!! Can provide more info if needed

If csc(α) = 3, where 0 < α < π/2, and β is a Quadrant II angle with tan(β) = −7, find   cos(α+β)   And there are others that I'm supposed to find, such as sin(α+β), but this is just the... more
Trigonometric Identities Trigonometry Math Help Math Problem

11/15/17

Trig questions

I am getting stuck at 7 plus or minus sqrt 309 / 26   13sin^2x-7sinx=5 solve for interval [0,360degrees] 
Trigonometric Identities Trigonometry

11/15/17

3. Find the value of θ cos4(θ) + sin2(θ) = cos2(θ) + sin4(θ)

they are squared and to the power of 4 
Trigonometric Identities Trigonometry

11/07/17

How do you find the exact value of this trig function without a calculator?

(1-(2(cos^2))(43.5°))/((sin84° sin7°)−(sin6° sin277°))

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.