Trig Identities Djedji
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Last updated 8:42 PM on 3/21/26
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5 Terms
1
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Pythagorean identities
sin2+cos2=1
tan2+1=sec2
cot2+1=csc2
2
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Even Identities
sin(-x) = -sin(x)
csc (-x) = -csc(x)
tan (-x) = -tan(x)
cot (-x) = -cot(x)
3
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Odd Identities
cos(-x) = cos(x)
sec(-x) = sec(x)
4
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Double Angle Formulas
sin(2x)=2sin(x)cos(x)
cos(2x)=cos2(x)-sin2(x)
tan(2x)=2tan(x)/(1-tan2(x))
5
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Power Reducing Formulas
sin2 =1-cos(2x)/2
cos2=1+cos(2x)/2
tan2=1-cos(2x)/1+cos(2x)
