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trig question

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

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
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.