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.
Trig Identities Calculus Trigonometry Trig

12/07/20

Trig Identities

Given 𝑠𝑖𝑛 𝛼 = 7 and 𝑠𝑖𝑛 𝛽 = 3, 𝛼 and 𝛽 in quadrant II, find 25 5(a) 𝑠𝑖𝑛(𝛼 + 𝛽), (b) 𝑡𝑎𝑛(𝛼 + 𝛽), and (c) the quadrant of 𝛼 + 𝛽.
Trig Identities Trigonometry Precal

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
Trig Identities

01/22/19

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

Trig Identities

03/13/18

Can you help me prove this equation?

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

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 
Trig Identities

02/09/18

What is Cosx= 3^1/2 -1 in the form of sin^2 x

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
Trig 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
Trig Identities Trignometry

11/29/17

cosA=5/13 sinB=15/17 find tan(A+B)

find tan(A+B)
Trig Identities Trigonometry Functions

11/21/17

Trig functions (indentities) question

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

07/22/17

verify identity

1 + tanΘ / 1 + tanΘ = tanΘ
Trig Identities

07/22/17

verify identity

sinΘ⁄ 1+cosΘ + 1+cosΘ/ sinΘ = 2cscΘ
Trig Identities

05/25/17

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

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

05/25/17

cos2x = cosx solve for interval (0 2π)

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

05/25/17

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

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

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
Trig Identities

05/25/17

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

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

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 
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

 Proving a trig identity and I dont know what to do 

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