book Maths Puzzle Numerical Ability

without using a calculator evealuate. csc45

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book Other Question

sina+cosa=7^.5/2

find the value of tan(a/2) prove that each number is rational by finding a pair of ntegers whose ratio or quotient is equal to the number
1. 3.56
2. -0.000230
3. -1.6 with a line over the 6
4. 5 3/8