# Week6 — Math 10

This week I learnt **Trigonometric Ratios. **From** **the questions on the workbook, I summed up some rules:

* Rule I: *1) sin x˚, sin y˚,

**if**x>y, so sin x˚>sin y˚

2) cos x˚, cos y˚, **if **x>y, so cos x˚<cos y˚

3) tan x˚, tan y˚, **if **x>y, so tan x˚>tan y˚

4) sin x˚, tan x˚, **so **sin x˚< tan x˚.

*Rule II: **sin x˚, cos x˚*

1) x<45˚ sin x˚< cos x˚

2) x=45˚ sin x˚= cos x˚

3) x>45˚ sin x˚> cos x˚

There is also a very important rule is **cos x˚=sin (90 – x)˚ **and** sin x˚=cos (90 – x)˚.**