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### 19 Cards in this Set

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 tan^2(x)+1= sec^2(x) 1+cot^2(x)= csc^2(x) sin(-x)= -sin(x) ODD function cos(-x)= cos(x) EVEN function tan(-x)= -tan(x) ODD function sin(x)= cos(90-x) cos(x)= sin(90-x) sin(a+b)= sin(a)cos(b)+cos(a)sin(b) cos(a+b)= cos(a)cos(b)-sin(a)sin(b) tan(a+b)= tan(a)+tan(b)/1-tan(a)tan(b) sin(a-b)= sin(a)cos(b)-cos(a)sin(b) cos(a-b)= cos(a)cos(b)+sin(a)sin(b) tan(a-b)= tan(a)-tan(b)/1+tan(a)tan(b) sin(2x)= 2sin(x)cos(x) cos(2x)= cos^2(x)-sin^2(x) 2cos^2(x)-1 1-2sin^2(x) tan(2x)= 2tan(x)/1-tan^2(x) sin(x/2)= pos/neg sq rt of 1-cos(x)/2 cos(x/2)= pos/neg sq rt of 1+cos(x)/2 tan(x/2)= pos/neg sq rt of 1-cos(x)/1+cos(x)