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79 Answered Questions for the topic Trigonometry Identities

Trigonometry Identities

04/27/15

Trig identities!

Please help, I have no idea! Solve the following trigonometric equation sin^2x - cos^2x = 1/4.

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Trigonometry Identities

01/19/15

prove the identity

(secθ-tanθ)^2=2secθtanθ

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Trigonometry Identities Trigonometry

01/08/15

How can I solve sin(2x) = sin(x/2) for all values of x?

I can find x = 0, and also can show that cos x = (1/4)*(-1+/-sqrt(5)), but I don't know how I should have known that the latter cosines of x correspond to angles involving fifths of pi (radians)?... more

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Trigonometry Identities Trigonometry

01/03/15

Solve for all values of 2sinx-1=0. in terms of pi

(show work) where 0≤x<2π

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Trigonometry Identities

07/24/14

How to prove this identity

tan3x - tan2x- tanx = tan3xtan2xtanx

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Trigonometry Identities

05/05/14

verify identity

sin(X)sec(x)=1-(cos^2)x/sin(X)cos(X)

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Trigonometry Identities Math Trigonometry Math Help

01/03/14

Rewrite 6(sin5x)cos2x

This is for my trig class. Thanks for the help!

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Trigonometry Identities Math Trigonometry Math Help

12/31/13

Use the sum or difference formulas to determine: A. sin105 degrees B. tan15 degrees

This is for my trig class. Thanks for the help!

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Trigonometry Identities Trigonometry Identities Verify Identity

12/12/13

Verify the identity 1/tan(theta)csc(theta) = cos(theta)

This is for my trig class, and the directions say to verify the identity. Thanks so much.

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Trigonometry Identities Calculus Trigonometry Precalculus Homework

12/11/13

Q2 POW #3 -Trig Identities

1) given the double angle identity for cosine: cos2θ=cos2θ-sin2θ Prove: cos3θ = cos3θ - 3cosθsin2θ and: cos4θ = cos4θ - 6cos2θsin2θ + sin2θ 2) Continue this process, finding an... more

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Trigonometry Identities

12/08/13

prove the trigonometric identity

(1-cos^2x)(cot^2+1) = 1

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Trigonometry Identities

12/08/13

prove the following trigonometric identity

2sin^2x - 1÷ sinxcosx = tanx-cotx

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Trigonometry Identities

11/25/13

Solve the Trigonometry Identity

cosx = (1- tan^2 x/2) / 1 + tan^2 x/2)Completely stuck.

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Trigonometry Identities

10/30/13

Trig Identities

Explain how you could determine the exact value of (sec 7pi/6) if you know the value of (sin 11pi/6). Prove with diagrams.I've no idea how to do this question that's worth 10 marks.

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Trigonometry Identities

10/28/13

Trig Identities

Prove1 - sin2x / cosx = sin2x / 2sinxI tried do both LHS and RHS. Got stuck after a step or two.

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Trigonometry Identities

10/28/13

Trig Identities

Provesec2x = 1 + tan2xI did R.H.S= 1 + sin2x / cos2x= 1 + (1 - cos2x) / (1 - sin2x)= 1 + cot2x= ???I think I'm doing it right, but I don't know how to solve now.

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Trigonometry Identities

10/22/13

Use the substitute x= tan y to show that

∫1 1 dx =¶ + 1 0 (1+x2)2 8 4

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Trigonometry Identities

10/21/13

Prove that 1 + sin b - cos b =2sin1/2b cos1/2b +sin1/2b

Prove that 1 +sin b -cos b=2sin 1 b cos 1 b +sin 1 b 2 2 2 and hence solve 1 +sin b -cos b =0 0 = <b=<2¶

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Trigonometry Identities Trigonometry Tangent Half Angle Double Angle

10/08/13

What is the height of the building?

Jay is 120 meters from the base of a building and Mary is 40 meters from the base of the building. Jay's angle of elevation when looking at the top of the building is X and Mary's is 2X. What is... more

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Trigonometry Identities

10/07/13