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 Post subject: Establish IdentityPosted: Fri, 27 Apr 2012 07:17:32 UTC
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sin(pi/2+theta)=cos(theta)

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 Post subject: Re: Establish IdentityPosted: Fri, 27 Apr 2012 07:20:09 UTC
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The Duke wrote:
sin(pi/2+theta)=cos(theta)

Use the sine sum identity.

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 Post subject: Re: Establish IdentityPosted: Fri, 27 Apr 2012 07:22:50 UTC
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show me how

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 Post subject: Re: Establish IdentityPosted: Fri, 27 Apr 2012 07:26:17 UTC
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The Duke wrote:
show me how

Nope. It's one step, if you cannot do that you need help from your teacher.

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 Post subject: Re: Establish IdentityPosted: Fri, 27 Apr 2012 12:54:18 UTC
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Joined: Mon, 29 Dec 2008 17:49:32 UTC
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The Duke wrote:
sin(pi/2+theta)=cos(theta)

Use the sine sum identity.

... or look at the unit circle, or ...

But it seems the OP doesn't want to put in any work.

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