Half Angle Formulas: No Negative Square Roots

Thread starter armolinasf
Start date Jun 4, 2011
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armolinasf

Thread starter
Jun 4, 2011

Homework Statement

I'm just wondering why we don't have to worry about the possibility of taking the square root of a negative number when dealing with the half angle formulas for sine and cosine. Thanks.

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olivermsun

Science Advisor

Jun 4, 2011

What are the maximum and minimum possible values for sin x and cos x?

armolinasf

Jun 4, 2011

wow! I got it, thanks.

Half Angle Formulas: No Negative Square Roots

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Half Angle Formulas: No Negative Square Roots

Homework Statement

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