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Trig Ident, Spec Ang
Trig Identities, Special Angles and The Unit Circle
Question | Answer |
---|---|
sec x | 1/cos x |
csc x | 1/sin x |
cot x (there are 2 answers) | 1/tan x, cos x / sin x |
tan x | sin x / cos x |
sin²x + cos²x | 1 |
1 + tan²x | sec²x |
1 + cot²x | csc²x |
cos(2x) (there are 3 answers) | cos²x - sin²x, 1 - 2sin²x, 2cos²x - 1 |
sin(2x) | 2sinxcosx |
tan(2x) | 2tanx / 1 - tan²x |
sin 30 | 1/2 |
sin π/6 | 1/2 |
sin 60 | √3/2 |
sin π/3 | √3/2 |
sin 45 | √2/2 |
sin π/4 | √2/2 |
cos 30 | √3/2 |
cos 60 | 1/2 |
cos 45 | √2/2 |
cos π/6 | √3/2 |
cos π/3 | 1/2 |
cos π/4 | √2/2 |
tan 30 | √3/3 |
tan π/6 | √3/3 |
tan 60 | √3 |
tan π/3 | √3 |
tan 45 | 1 |
tan π/4 | 1 |