Book Maths Puzzle

cos A+sec A=10/3
find sin A+cosec A

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Book Other Question

The time taken for a computer link to be made between the terminal in an executive's office and the computer at a remote factory site has a normal distribution with a mean of 15 seconds and a standard deviation of 3 seconds.On 90% of the occasions, the computer link is made in less than_____ 457=14
782=55
842=66
276=?