66 Answered Questions for the topic Trig Identities

03/29/19

#### Solve the equation. Cos^2θ-sin^2θ=1+sinθ on the interval 0<θ<2π

Please help! This is for my precal class test review and I’ve been trying to solve it for an hour now and can’t seem to figure out how to do it. Here is the problem once again: cos2θ-sin2θ=1+sinθ... more

01/22/19

03/13/18

#### Can you help me prove this equation?

(sin+1)(sin-1)=cotsin-2cos

02/12/18

#### tan^2x - sin^2x = sin^2x • tan^2x

I don’t know how to figure out this proof. the only relationship i can think of is tan = sin/cos

02/09/18

Trig identities

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... more

12/03/17

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

11/29/17

find tan(A+B)

11/21/17

#### Trig functions (indentities) question

Solve:     2sin2x=cotx    , -π ≤ x ≤ 2π

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.

07/22/17

#### verify identity

1 + tanΘ / 1 + tanΘ = tanΘ

07/22/17

#### verify identity

sinΘ⁄ 1+cosΘ + 1+cosΘ/ sinΘ = 2cscΘ

05/25/17

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

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

05/25/17

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

cos2x = cosx solve for interval (0 2π) algebraic means without calculator

05/25/17

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

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

05/25/17

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

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

05/25/17

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

sin4x - sin2x = 0 solve for interval (0 2π) algebraic means without calculator

05/25/17

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

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

05/25/17

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

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

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

05/25/17

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

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

03/27/17

#### (cos B/cot B) + (sin B/tan B) = sin B + cos B

Verify the Identity.

03/19/17

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

Proving a trig identity and I dont know what to do

03/09/17

#### Proving Trig Identity

I'm having trouble trying to prove this trig identity. Help is greatly appreciated. Thanks in advance. 1/(csc-cot) = (1+cos)/sin

12/03/16

#### Simple Trig, got lost and need help.

Solve the given equation over the interval [0,2): 2sinx+ (sqrt 3) sin^2x=-(sqrt 3) cos^2x A. x=0, and x=(pi/2), and x=(3 pi/2), and x=2(pi)x=(3 pi/2), and x=(7 pi/2) b. x=(4 pi/3) and x=(5... more
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