Trigonometric Ratio

Mer som dette

New Year's Resolutions

Ved Jorge Mauricio Vila Gonzalez

R-formula and Trigonometry

Ved Ryan Tan

Edward De Bono's thinking hats

Ved Aly Vermont

Right Triangle Trig

Ved Amanda Mikiciuk

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