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Basic Trig Ids
Reciprocal/Quotient/Pythagorean/Cofunction/Even&Odd Identities
Question | Answer |
---|---|
sin^2(x) + cos^2(x) | 1 |
1 + cot^2(x) | csc^2(x) |
tan^2(x) + 1 | sec^2(x) |
sinx/cosx | tanx |
cosx/sinx | cotx |
1/cosx | secx |
1/sinx | cscx |
1/tanx | cotx |
1/secx | cosx |
1/cscx | sinx |
1/cotx | tanx |
cos(-x) | cosx |
sin(-x) | -sinx |
tan(-x) | -tanx |
sec(-x) | secx |
csc(-x) | -cscx |
cot(-x) | -cotx |
sin(90 - x) | cosx |
cos(90 - x) | sinx |
tan(90 - x) | cotx |
cot(90 - x) | tanx |
sec(90 - x) | cscx |
csc(90 - x) | secx |
1 - sin^2(x) | cos^2(x) |
1 - cos^2(x) | sin^2(x) |
csc^2(x) - cot^2(x) | 1 |
csc^2(x) - 1 | cot^2(x) |
sec^2(x) - 1 | tan^2(x) |
sec^2(x) - tan^2(x) | 1 |
sin(x - 90) | sin[-(90 - x)] = -sin(90 - x) = -cosx |
cos(x - 90) | cos[-(90 - x)] = cos(90 - x) = sinx |
tan(x - 90) | tan[-(90 - x)] = -tan(90 - x) = -cotx |