Hey.
1- Express 12cosx+ 9sinx in the form Rcos(x-A) where R is greater than 0 and A is between 0 and 90.
I did this one and got 15cos(x-0,644) (in radians)
I cant do the second part.
b) Use the method of part a to find the smallest positve root of A of the equation 12cosx+9sinx = 14
Thanks.