Qualification > Math

Functions

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elemis:
I basically sketched the graph. The steps are as follows :

y = 3- 2sin x

First I drew the regular sine graph.

The part in blue represents a vertical stretch of -2. So I multiplied each Y Coordinate by -2

The part in red represents a vertical TRANSLATION of 3 units UPWARDS. So I added 3 to each Y COORDINATE.

You should get a graph as below :

Next, we look at the maximum and minimum Y Value : this is our range for the function.

ashish:
yeah that's good but it's good to know that sin90 and sin270 are 1 and -1 (maximum and minimum) so as not loose time in exams

Kgatlhi:
thanks guys!  :)

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