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Trigonometric Formulas
Trigonometric Formulas
Reciprocal Properties:
Quotient Properties:
Odd/Even Identities
1. sin (–x) = –sin x
2. cos (–x) = cos x
3. tan (–x) = –tan x
4. csc (–x) = –csc x
5. sec (–x) = sec x
6. cot (–x) = –cot x
Cofunction Identity - radians
Cofunction Identities - radians
Periodicity Identities - radians
Periodicity Identities - degrees
Sum/Difference Identities
sin (x + y) = sin(x) cos(y) + cos(x) sin(y),
cos(x + y) = cos(x) cos(y) - sin(x) sin(y),
sin(x - y) = sin(x) cos(y) - cos(x) sin(y),
cos(x - y) = cos(x) cos(y) + sin(x) sin(y),
Double Angle Identities
sin(2x) = 2 sin(x) cos(x),
cos(2x) = cos2(x) - sin2(x),
cos(2x) = 2 cos2(x) - 1,
cos(2x) = 1 - 2 sin2(x),
tan(2x) = [2 tan(x)]/[1-tan2(x)],
Half Angle Identities
Product identities
Sum to Product Identities
All Lessons
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If two wrongs don't make a right, try three.
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It is a mathematical fact that fifty percent of all doctors graduate in the bottom half of their class.
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