The following trigonometric limits are helpful in computing most trigonometric limits (Click on the links to view each limit's proof)

- `lim_(theta -> 0) sin(theta) = 0`
- `lim_(theta -> 0) cos(theta) = 1`
- `lim_(theta -> 0) sin(theta)/theta = 1`
- `lim_(theta -> 0) tan(theta)/theta = 1`
- `lim_(theta -> a) sin(theta - a)/(theta - a) = 1`
- `lim_(theta -> a) tan(theta - a)/(theta - a) = 1`

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