What is sin(x-90)?
1 Answer
Dec 17, 2015
Explanation:
Use the sine angle subtraction formula:
sin(alpha-beta)=sin(alpha)cos(beta)-cos(alpha)sin(beta)
Therefore,
sin(x-90˚)=sin(x)cos(90˚)-cos(x)sin(90˚)
=sin(x)(0)-cos(x)(1)
=-cos(x)
