266 Answered Questions for the topic trigonometric identities

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...
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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

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.

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.

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

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...
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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...
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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...
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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)

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...
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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°))

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