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plz solve my question as soon as possible present in the( attached image)

plz solve my question as soon as possible present in the( attached image)

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Grade:12

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
It can be written as cos-1 ( cos (17pi/15) )
 
Cos-1 ( cos (pi – 2 pi/15) )
 
 = cos-1( – cos (2 pi/15) )
 
 =  pi – cos-1( cos (2pi/15) )
 
 = pi – 2 pi/15 = 13 pi/15

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