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Mathematics 10 Online
OpenStudy (anonymous):

what is the missing justification in the proof of the pythagorean identity sin ^x +cos ^x

Directrix (directrix):

I think that this is supposed to be: sin ² x + cos² x = 1

Directrix (directrix):

Please add this part of the question: >>what is the missing justification in the proof @anieca09

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