Author Topic: Useful Trigonometric Identities  (Read 3948 times)

Offline Alberto Dominguez

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Useful Trigonometric Identities
« on: December 17, 2011, 09:47:19 AM »
« Last Edit: December 17, 2011, 09:49:05 AM by Alberto Dominguez »
Kind regards,

Alberto Domínguez
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Offline Alberto Dominguez

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Re: Useful Trigonometric Identities
« Reply #1 on: February 12, 2012, 11:44:08 AM »
sinx=\sqrt{\frac{1-cos2x}{2}}

cosx=\sqrt{\frac{1+cos2x}{2}}
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Offline Alberto Dominguez

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Re: Useful Trigonometric Identities
« Reply #2 on: August 27, 2012, 08:01:18 PM »
<br />sen(x+y)=senxcoxy+cosxseny<br /><br />sen(x-y)=senxcoxy-cosxseny<br /><br />cos(x+y)=cosxcoxy-senxseny<br /><br />cos(x-y)=cosxcoxy+senxseny<br />
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Offline Alberto Dominguez

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Re: Useful Trigonometric Identities
« Reply #3 on: August 31, 2012, 08:09:13 PM »
Asen\alpha+Bcos\alpha=\sqrt{A^{2}+B^{2}}sen(\alpha+\varphi)
\varphi=arctg\frac{B}{A}
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