# Summary

- In a circle of radius
- Radian measure
- Degree measure
- All trigonometric ratios are positive in

sin and cosec are positive in

tan and cot are positive in and

*cos*and sec are positive in

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- In a circle of radius
- Radian measure
- Degree measure
- All trigonometric ratios are positive in

sin and cosec are positive in

tan and cot are positive in and

*cos*and sec are positive in

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