Confused on steps to finding smallest positive radians

Question

Consider the equation cos(3.14t)=-0.7. Find the smallest positive solution in radians and round your answer to 4 decimal places

Consider the equation tan(3.25t)-6.6. Find the smallest positive solution in radians and round your answer to 4 decimal places.

Answer 1

cos (3.14t) = -0.7

 

Therefore 3.14t = arccos(-0.7) which will be an 'angle' in radian measure provided the calculator was set in radian mode. This (intermediate) answer will be in the second quadrant.

 

Then solve for t.