self Maths Puzzle

the simplified value of 1- (sin^2A)/1+cosA + (1+cosA)/sinA - (sinA)/1-cosA is

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self Other Question

The mean of 19 observaton is 24. If the mean of the first 10 observations is 17 and that of the last 10 observations is 24,find the 10th observation. How many words can be arranged taking 4 at a time from the letters of the word MATHEMATICS?