Trigonometric Ratio

Lisää tämän kaltaisia

Ratio

luonut Li Jiaxin

Geometry

luonut Stacy Julian

Intro to elementary mathematics

luonut christina catchings

Triangles and Quadrilaterals

luonut keshav sahni

Trigonometric Ratio

The CAST rule

C Quadrant

cosθ and secθ will be positive

A Quadrant

All trigonometric ratios and their corresponding reciprocal functions are positive.

T Quadrant

tanθ and cotθ will be positive

S Quadrant

sinθ and cscθ will be positive.

The special triangles

How to sketch an angle

Terminal Arm: the ray the defines the end of the angle

Initial Arm: the ray that defines the beginning of the angle.

An example

tan(11π/6)= -tan(π/6)= -1/√3

sec (5π/4) = -sec(π/4)= -√2