266 Answered Questions for the topic trigonometric identities

Trigonometric Identities

11/30/14

#### angle x lies in second quadrant and tan x =-5/4. Determine sin2x and tan 2x

Trigonometric Identities Trigonometric Inverses

11/16/14

#### Can someone explain this problem to me and/or at least get me started?

I have no idea what half of the words are in this problem, much less how to solve it. I'm not sure what equation(s) I would use to work it as well. If it's any hint we're working on trigonometric... more
Trigonometric Identities

11/15/14

#### (1-cos2t)/sin^2t = 2cot^2t

Trigonometric Identities

11/15/14

#### ((tan2x)(1+tanx))/tanx = 2/(1-tanx)

Trigonometric Identities

11/08/14

#### please, prove that (1-2cos^2x)/(sinx*cosx) = tanx-cotx

I'm stumped on this one! help please!
Trigonometric Identities

11/05/14

#### How do I answer this trig identity?

ln|1+cos(theta)|+ln|1-cos(theta)| = 2ln|sin(theta)|
Trigonometric Identities Trigonometry

10/26/14

#### Establish the given identity

Sin(A-B) / (SinASinB) = CotB - CotA

10/21/14

#### Calculus Question: Tangents on Polar Coordinate of Polar Curve r=cos(theta)+sin(theta)

How do I find the polar coordinates of the points on the polar curve r=cos(theta)+sin(theta), 0(greater than or equal to)(theta)(less than or equal to)(pi), where the tangent line is horizontal or... more
Trigonometric Identities Trigonometry

10/19/14

#### Prove the equation

csc / (1 + csc) = (1 - sin) / cos^2
Trigonometric Identities Trigonometry Intermediate Value Theorem

10/10/14

#### Difficulty with the Intermediate Value Thereom

True or False and explain: there is at least one point x between 0 and π/2 where cos(x)+sin(x)=x^2.   Should I try plugging in the two numbers given into the equation or do I need to simplify the... more
Trigonometric Identities

09/27/14

#### How to solve this equation

cos(x).cos(2x)cos(4x)cos(8x)= sin16x/16sinx prove this !
Trigonometric Identities Math Trigonometry Math Help

09/25/14

#### Trigonometry

If 270º <x< 360º , show that √(2+√(2+2cosx)) = 2 sin x/4.   Thank You! :)
Trigonometric Identities Math Trigonometry Mathematics

09/25/14

#### Trigonometry

Prove that cos6x + sin6x = (5+3cos4x)/8   Thank You! :)
Trigonometric Identities Trigonometry Math Help Thank You

09/25/14

#### Trigonometry

Prove that tanx = cotx - 2 cot 2x. Hence show that 2tan20º + 4tan40º + 8tan80º = 9(cot 10º-tan10º)   Thank You!:)
Trigonometric Identities Trigonometry Trig Trig Identies

08/27/14

#### (x+5)^4 (3x-1)^-2 + (x+5)^3 (3x-1)^-1

no calc just trig identities please show work! thakns so much for any help!
Trigonometric Identities

07/19/14

#### (Cos 5/2 A + Cos 3/2 A) / (Sin 3?2A + Sin A/2) = Cot A Cos A - Sin A

Prove that (Cos 5/2 A + Cos 3/2 A) / (Sin 3?2A + Sin A/2) ≡ Cot A Cos A - Sin A
Trigonometric Identities

07/19/14

#### Tan (P+Q) - Tan P = Sin Q / Cos P Cos (P+Q)

Prove Tan (P+Q) - Tan P ≡ Sin Q / Cos P Cos (P+Q)
Trigonometric Identities

07/19/14

#### (Sin x Tan x) / (Tan x - Sin x) = (Tan x + Sin x) / (Sin x Tan x)

(Sin x Tan x) / (Tan x - Sin x) ≡ (Tan x + Sin x) / (Sin x Tan x)   LHS, (Sin x Tan x) / (Tan x - Sin x)
Trigonometric Identities

07/19/14

#### cos^4 x + sin^2 x = sin^4 x + cos^2 x

cos^4 x + sin^2 x ≡ sin^4 x + cos^2 x   LHS, cos^4 x + sin^2 x
Trigonometric Identities

07/19/14

#### cos^4 x + sin^2 x = sin^4 x + cos^2 x

cos^4 x + sin^2 x = sin^4 x + cos^2 x   how to prove?
Trigonometric Identities

07/03/14

#### tan2x=1-secx

We are supposed to find all solutions for each of the equations on the interval [0,2Π] please help as soon as possible.
Trigonometric Identities

06/29/14

#### cost+tantsint=sect

i need to prove this with trigonometric identities, i'm kind of lost. thanks.
Trigonometric Identities Verify

05/12/14

#### tan^2x(csc^2x-1)=1

what are the steps to verify this trig identity
Trigonometric Identities

04/30/14

#### how to solve this trigonometric identity

csc^2(x)/tan(x)+cot(x)
Trigonometric Identities 51153

04/28/14