Question

which are equivalent to the function 3cosx+2?

A. 3sin(x+pi/2)+2
B. 3cos(-x)+2
C. 3sin(x-pi/2)+2
D. -3cos x-2

Answer 1

Do you know the odd-even properties of trig functions?
\[\LARGE sin(-x)=-sinx\]
\[\LARGE cos(-x)=cosx\]
\[\LARGE tan(-x)=-tanx\]