Precalc Math HW help please!

Question

Consider the equation cos(3.10t)=.3. Find the smallest positive solutions in radians and round your answer to 4 decimals.

Answer 1

cos(3.1t) = .3

3.1t = cos^-1(.3)

t = [cos^-1(.3)]/3.1 = 23.4008 degrees

divide by 180 to get .13000pi radians

multiply by 3.141593 to get .4084 radians