trig question

Question

Consider the equation cos(4.38t)=0.1 Find the smallest positive solution in radians and round your answer to 4 decimal places

Answer 1

cos(4.38t) = 0.1

take the inverse cosine of both sides:

4.38t = cos^-1(0.1) = 1.4706

divide both sides by 4.38:

t = 1.4706/4.38 = 0.3357

Answer 2

cos(4.38t) = 0.1

 

Take the inverse cosine of both sides:

 

4.38t = cos^-1(0.1)

 

t = cos^-1(0.1)/4.38

 

Solve for t.