70 Answered Questions for the topic Trig Identities

01/26/21

#### sin(x+y)-sin(x-y)=2sinycosx

I can't seem to figure out how to solve the right side of this to= sin(x+y)-sin(x-y)? Please help! Thx.

12/07/20

#### Trig Identities

Given š šš š¼ = 7 and š šš š½ = 3, š¼ and š½ in quadrant II, find 25 5(a) š šš(š¼ + š½), (b) š”šš(š¼ + š½), and (c) the quadrant of š¼ + š½.

03/29/19

#### Solve the equation. Cos^2Īø-sin^2Īø=1+sinĪø on the interval 0<Īø<2Ļ

Please help! This is for my precal class test review and Iāve been trying to solve it for an hour now and canāt seem to figure out how to do it. Here is the problem once again: cos2Īø-sin2Īø=1+sinĪø...
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Trig Identities

01/22/19

#### 1+cosx+sinx/1+cosx-sinx=secx+tanx

Trig Identities

02/12/18

#### tan^2x - sin^2x = sin^2x ā¢ tan^2x

I donāt know how to figure out this proof. the only relationship i can think of is tan = sin/cosĀ

01/31/18

#### Turing Trig Expression into Algebraic Expression

I have no idea how to turn this into an algebraic expression, please help ASAP!
Please give me tips on how to do this with other trig to algebraic expressions, as I have four problems I am quite...
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12/03/17

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

If csc(Ī±) = 3, where 0 < Ī± <Ā Ļ/2, and Ī² is a Quadrant II angle with tan(Ī²) = ā7, find
Ā
cos(Ī±+Ī²)
Ā
And there are others that I'm supposed to find, such asĀ sin(Ī±+Ī²), but this is just the...
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Trig Identities

10/29/17

#### if cos theta = -2/6 and tan theta < 0, then what are all the other 5 trigonometric ratios

if cos theta = -2/6 and tan theta < 0, then what are all the other 5 trigonometric ratios
tan(theta)= ?
sin (theta) =?
sec (theta) =?
csc (theta) =?
cot (theta) =?

Trig Identities Help Asap Please

10/03/17

#### What is the exact value of Sin (380) degrees?

I know how to solve these when it involves actual angles from the unit circle, but I can't seem to find it for those angles not on the unit circle.

Trig Identities

05/25/17

#### 5tanx = 2sin2x solve for interval (0 2Ļ)

5tanx = 2sin2x solve for interval (0 2Ļ)algebraic means without calculator

Trig Identities

05/25/17

#### cos2x = cosx solve for interval (0 2Ļ)

cos2x = cosx solve for interval (0 2Ļ)
algebraic means without calculatorĀ

Trig Identities

05/25/17

#### 5tanx = 2sinsx solve for interval (0 2Ļ)

5tanx = 2sinsx solve for interval (0 2Ļ)
algebraic means without calculator

Trig Identities

05/25/17

#### sin x- sq root 3 cosx = 0 solve for interval (0 2Ļ)

sin x- sq root 3 cosx = 0 solve for interval (0 2Ļ)
algebraic means without calculator

Trig Identities

05/25/17

#### sin4x - sin2x = 0 solve for interval (0 2Ļ)

sin4x - sin2x = 0 solve for interval (0 2Ļ)
algebraic means without calculatorĀ

Trig Identities

05/25/17

#### sin (x/2) = 1- cosx solve for interval (0 2Ļ)

sin (x/2) = 1- cosx solve for interval (0 2Ļ)
algebraic means without a calculatorĀ

Trig Identities

05/25/17

#### prove (sinx+siny)/(cosx-cosy) = -cot(x-y/2)

(sinx+siny)/(cosx-cosy) = -cot(x-y/2)
use left as given

Trig Identities

05/25/17

#### prove sinxcosy = (1/2)(sin(x+y)+sin(x-y))

sinxcosy = (1/2)(sin(x+y)+sin(x-y))
left side is the given

Trig Identities

05/25/17

#### prove (1+cosx)/(sinx) + (sinx)/(1+cosx) = 2cscx

(1+cosx)/(sinx) + (sinx)/(1+cosx) = 2cscx
use left side as given

Trig Identities Trig

03/19/17

#### prove that cosx-cosx sin^2x = cos^3x

Ā Proving a trig identity and I dont know what to doĀ

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