Cos X Sin 2x 1

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Does one - sin^2x = cos^2x?

• Thread starter bobsmith76
• Kickoff appointment January 25, 2012

Homework Argument

My book is showing ane - (sin^2)ten = (cos^2)x, is this truthful? If and then nether what subject area do I find more information about this. I found cofunction identities where sin(90° - θ) = cosθ but I'm not certain if that'south the same thing.

Homework Equations

The Attempt at a Solution

Answers and Replies

Homework Statement

My book is showing 1 - (sin^2)x = (cos^2)x, is this true? If and so under what discipline do I find more data nearly this. I found cofunction identities where sin(xc° - θ) = cosθ simply I'm not sure if that's the aforementioned thing.

Homework Equations

The Attempt at a Solution

Simply rearrange [itex]\sin^ii 10 + \cos^2 10 = 1[/itex], which you recently asked about in another thread.

My book is showing 1 - (sin^two)10 = (cos^ii)x, is this truthful?

Yep, draw a right triangle and label one of the angles x. At present label each side a, b and c. Ok and so what is sin(x) in terms of a,b,c? So what is sin²(x)? Go on this for cos²(x) and you'll meet the outcome holds.

If so under what field of study do I notice more data about this.

Basic trigonometry? Later being taught nigh graphing trig functions I believe you're exposed to more trig identities.

thanks, i feel stupid, but at least i know the answer

thanks, i feel stupid, but at least i know the reply

Nah being stupid would be non knowing the respond in the exam

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Cos X Sin 2x 1,

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