verify the identify:

http://img340.imageshack.us/img340/2779/xxaa5.jpg

since cos2u=cos^2-sin^2

would the same be applied to cos3u..as in = cos^3-sin^3, or am i wrong

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- April 17th 2008, 05:46 PMalgebra2trig verify the identify
verify the identify:

http://img340.imageshack.us/img340/2779/xxaa5.jpg

since cos2u=cos^2-sin^2

would the same be applied to cos3u..as in = cos^3-sin^3, or am i wrong - April 17th 2008, 06:12 PMtopsquark