Unit circle properties sin( x) = sin(x) tan( x) = tan(x) sin( + x) = sin(x) tan( + sin(2 x) = sin(x) Create your own worksheets like this one with infinite geometry Free trial available at kutasoftware.com. (cos x + dx i sin x) = sin x + i cos x = i(cos x + i sin x) so cos x + i sin x has the correct derivative to be the desired extension of the exponential function to the case c = i. Cos(a − b) = cos a cos b + sin a sin b (8) notice that by remembering the identities (2) and (3) you can easily work out the signs in these last two identities.
Trigonometry identities quotient identities:reciprocal identities
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