How do you prove the reduction identities #Cos(x+pi)= -cos(x)# using a unit circle diagram?
2 Answers
Aug 19, 2015
I am not sure this little diagram is enough but...
Explanation:
Have a look:
Aug 20, 2015
Supplementary arcs: sin x and
Explanation:
The trig unit circle shows the relationship between the supplementary arcs: